REALLY old domain controller still in AD. Ok to delete (how)?

Just ran dcdiag /a /v /c on both of my 2003 domain controllers and everything passes except for the following.  The server in question ("A_Server") has not been running in over 6 years now.  It used to be the original domain controller and Exchange server way back when.  We've been running with our two current domain controllers and current Exchange server for over 6 years now.  Is it ok to delete it, and if so, how?  Here's the exact error from DCDiag:

  Starting test: VerifyEnterpriseReferences
         The following problems were found while verifying various important DN

         references.  Note, that  these problems can be reported because of

         latency in replication.  So follow up to resolve the following

         problems, only if the same problem is reported on all DCs for a given

         domain or if  the problem persists after replication has had

         reasonable time to replicate changes.
            [1] Problem: Missing Expected Value

             Base Object:

            CN=A_SERVER,CN=Domain System Volume (SYSVOL share),CN=File Replication Service,CN=System,DC=mydomain,DC=com

             Base Object Description: "SYSVOL FRS Member Object"

             Value Object Attribute Name: frsComputerReference

             Value Object Description: "DC Account Object"

             Recommended Action: Check if this server is deleted, and if so

            clean up this DCs SYSVOL FRS Member Object.  Also see Knowledge

            Base Article:  Q312862

             
            [2] Problem: Missing Expected Value

             Base Object:

            CN=A_SERVER,CN=Domain System Volume (SYSVOL share),CN=File Replication Service,CN=System,DC=mydomain,DC=com

             Base Object Description: "SYSVOL FRS Member Object"

             Value Object Attribute Name: serverReference

             Value Object Description: "DSA Object"

             Recommended Action: Check if this server is deleted, and if so

            clean up this DCs SYSVOL FRS Member Object.  Also see Knowledge

            Base Article  Q312862

             
         ......................... ADC1 failed test VerifyEnterpriseReferences
tenoverAsked:
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Mike KlineCommented:
Wow 6 years, well yes it is definitely ok to delete it.  Since the box is not up you can't gracefully demote it.  You have to do what is known as a metadata cleanup (From one of your good DCs)

http://www.petri.co.il/delete_failed_dcs_from_ad.htm

Thanks
Mike

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RobinHumanCommented:
It should be fine to remove it if it's been off for that long and no thing bad has happened...
Take a look at this article about manually removing powered-off DC's
http://briandesmond.com/blog/manually-removing-a-domain-controller-from-active-directory/
Hope this helps you
Cheers

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Angel_expertCommented:
Yes, you can sure remove Old DC. Use 'ntdsutil' command to cleanup AD metadata. Refer MS article:
http://support.microsoft.com/kb/216498

Cheers,
Pravin
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