How to find and replace text within an Array Collection in Flex 3

K here is my code, i am loading a xml file into the flex file and populating a datagrid.  I actually use the browser manager to get variables across the url that i use in a URL request but i have taken the URL request out and just put data.xml for the loaded information in this code.  My question is the xml comes back with 1 and a 2 and a 3 for AdvancedDataGridColumn of Rank dataField="Rank_Index".  Is there anyway i can find and replace with that column or find and replace in general 2= bronze, 3 - silver etc with in my myAC Array Collection.  Ideally the change would be done on the datasources end but since i cant do that i am wondering if I can do it on my end.

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"  historyManagementEnabled="false" creationComplete="init(event),myHS.send()" >
    <mx:Script>
    <![CDATA[
        import mx.managers.BrowserManager;
        import mx.managers.IBrowserManager;
        import mx.utils.URLUtil;

        private var bm:IBrowserManager;
        [Bindable]
        private var fName:String;
        [Bindable]
        private var lName:String;            

        private function init(e:Event):void {
            bm = BrowserManager.getInstance();                
            bm.init("", "Welcome!");

            /* The following code will parse a URL that passes firstName and lastName as
               query string parameters after the "#" sign; for example:
               http://www.mydomain.com/MyApp.html#firstName=Nick&lastName=Danger */
            var o:Object = URLUtil.stringToObject(bm.fragment, "&");                
            fName = o.Max4UUserID;
            lName = o.DistId;
                         
        }
    ]]>
    </mx:Script>
<mx:HTTPService id="myHS" url="data.xml" result="gotResult(event)"/>
<mx:Script>
      <![CDATA[
            import mx.collections.SortField;
            import mx.collections.Sort;
            import mx.collections.IViewCursor;
            import mx.events.FlexEvent;
            import mx.collections.ArrayCollection;
            import mx.rpc.events.ResultEvent;
           
            [Bindable] private var cursor:IViewCursor;
            [Bindable] private var myAC:ArrayCollection;
                     
            private function initApp():void
                  {
                  this.myHS.send();
                  }
            private function gotResult(e:Object):void
            {
                this.myAC = myHS.lastResult.results.row as ArrayCollection
                if( this.myAC)
                {
                        var sort:Sort = new Sort();
                        sort.fields = [ new SortField("ROMAN_NAME_1",true) ];
                        this.myAC.sort = sort;
                        this.myAC.refresh();
                        this.cursor = this.myAC.createCursor();
                       
                }
            }
                                   
            private function searchID():void
                        {
                        if(search_ti.text != "")
                        {
                        if(this.cursor.findFirst({ROMAN_NAME_1:search_ti.text}))
                        {
                      var idx:int = this.myAC.getItemIndex(this.cursor.current);
                      this.myADG.scrollToIndex(idx);
                      this.myADG.selectedItem = this.cursor.current;
                        }
                        }
                        }
        public function highlightID(data:Object, column:AdvancedDataGridColumn):Object
        {
            if (data.DIST_ID > 3000)
                return { color : "blue" };
            else
                return null;
        }        
       
                        private function refilter():void
                        {
                                if( filter.text.length == 0)
                                        this.myAC.filterFunction = null;
                                else
                                        this.myAC.filterFunction = filterAC;                            
                                this.myAC.refresh();
                        }
                        private function filterAC( e:Object):Boolean
                        {
                                if( String(e.ROMAN_NAME_1).substr(0, filter.text.length) == filter.text)
                                        return true;    
                                return false;
                        }        
       
       
      ]]>
</mx:Script>
<mx:Form>
        <mx:FormItem label="First name:">
            <mx:Label id="ti1" text="{fName}"/>
        </mx:FormItem>
        <mx:FormItem label="Last name:">
            <mx:Label id="ti2" text="{lName}"/>
        </mx:FormItem>
    </mx:Form>
<mx:Form x="0" y="165" alpha="0.0">
            <mx:FormItem alpha="0.0">
                  <mx:TextInput id="search_ti"/>
            </mx:FormItem>
                  <mx:FormItem>
                        <mx:Button click="searchID()" alpha="0.0"/>
                  </mx:FormItem>
      </mx:Form>
<mx:Form verticalCenter="-229" horizontalCenter="-12">
            <mx:FormItem label="Search">
                  <mx:TextInput id="filter" change="refilter()"/>
            </mx:FormItem>
      </mx:Form>
     
<mx:Panel width="612" height="456" layout="absolute" horizontalCenter="0" verticalCenter="18" resizeEffect="Resize" title="Top 25 Report">
 
 
<mx:AdvancedDataGrid id="myADG" dataProvider="{myAC}" width="542" variableRowHeight="true" wordWrap="true" height="422" horizontalCenter="0" verticalCenter="2">
  <mx:columns>
    <mx:AdvancedDataGridColumn headerText="Name" dataField="ROMAN_NAME_1" />
    <mx:AdvancedDataGridColumn headerText="Enrollment Date" dataField="ENTRY_DATE"/>
    <mx:AdvancedDataGridColumn headerText="Type" dataField="SHORT_DESC" />
    <mx:AdvancedDataGridColumn headerText="Rank" dataField="RANK_INDEX" />
    <mx:AdvancedDataGridColumn headerText="Date Achieved" dataField="EFFECTIVE_DATE" />
  </mx:columns>
</mx:AdvancedDataGrid>
     
</mx:Panel>
</mx:Application>
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