failed VerifyEnterpriseReferences

About a month ago, I migrated completely migrated to Windows 2012 (standard) Active Directory.  I demoted all Windows 2003/2008 (they are all gone).  I raised forest and domain functional level to Windows 2012.  I am not experiencing any problem.  Everything is just smooth and wonderful.  
I am about to transition to Exchange server 2013 from Exchange 2010.  One of the preparation is to run:

Dcdiag /v /c /d /e /s:DCName >c:\dcdiag.log

I get the following errors in the DCDIAG. I researched it on Google and Expert-Exchange and could not find a clear answer.  I don’t know if I should be concern about it because everything seems to be fine.
Can anyone comment of these errors please:
DCDiag errors:
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=DC2012,OU=Domain Controllers,DC=nsbn,DC=corp              Base Object Description: "DC Account Object"              Value Object Attribute Name: msDFSR-ComputerReferenceBL              Value Object Description: "SYSVOL FRS Member Object"              Recommended Action: See Knowledge Base Article: Q312862              
            [2] Problem: Missing Expected Value              Base Object: CN=DC2012BU,OU=Domain Controllers,DC=nsbn,DC=corp              Base Object Description: "DC Account Object"              Value Object Attribute Name: msDFSR-ComputerReferenceBL              Value Object Description: "SYSVOL FRS Member Object"              Recommended Action: See Knowledge Base Article: Q312862              
            [3] Problem: Missing Expected Value              Base Object: CN=DC2012GK,OU=Domain Controllers,DC=nsbn,DC=corp              Base Object Description: "DC Account Object"              Value Object Attribute Name: msDFSR-ComputerReferenceBL              Value Object Description: "SYSVOL FRS Member Object"              Recommended Action: See Knowledge Base Article: Q312862              
            LDAP Error 0x20 (32) - No Such Object.
         ......................... DC2012 failed test
      Starting test: FrsEvent          * The File Replication Service Event log test
         The event log File Replication Service on server DC2012BU.nsbn.corp          could not be queried, error 0x6ba "The RPC server is unavailable."          ......................... DC2012BU failed test FrsEvent
Starting test: KccEvent
         * The KCC Event log test
         The event log Directory Service on server DC2012BU.nsbn.corp could not          be queried, error 0x6ba "The RPC server is unavailable."          ......................... DC2012BU failed test KccEvent
Starting test: SystemLog
         * The System Event log test
         The event log System on server DC2012BU.nsbn.corp could not be          queried, error 0x6ba "The RPC server is unavailable."          ......................... DC2012BU failed test SystemLog