Yesterday I demoted a 2003R2 DC (but forgot to remove the DNS role), removed it from the domain, changed it's IP address and shut it down. Everything went pretty well (minus a host of authentication issues across the domain until I added the old IP for this DC to it's replacement 2008R2 DC) but I'm still seeing four SRV records in DNS for this DC. DNS is still showing _ldap SRV records for DC1, one each under:
DC1 is not listed under any other zone including _msdcs.
Can I simply delete these _ldap SRV records for the demoted DC?