I am using the FRSDIAG room(from tech-net) to do diagnosis on FRS replication. The issue is its tying to check the DC's which no ,longer exist . Error being "missing server reference for the server XXXX". Where is it getting those servers from? they don't exist in AD as objects. please let me know if any extra information is required.
If you use ADSIEdit, connect to the Default Naming Context.
DC=Domain > CN=System > CN=File Replication Service > CN=Domain System Volume (SYSVOL Share)
The nTFRSMember references are under that location, and each has an attribute "serverReference".