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We are upgrading our active Directory from 2003 SP2 to 2008 R2, we've decided to demote a domain controller that was also the secondary DNS server, demotion went fine with no errors, but we started having events 1083 and 1955 (Replication conflict) repeatedly, while trouble shooting the problem, we've noticed that in the DNS zone, under _msdcs we still have all the entries for the demoted domain controller, aren't these records supposed to be removed in the demotion process? Should we go ahead and delete them manually? Should we expect any problems in the upgrade process because of these entries?
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We are upgrading our active Directory from 2003 SP2 to 2008 R2, we've decided to demote a domain controller that was also the secondary DNS server, demotion went fine with no errors, but we started having events 1083 and 1955 (Replication conflict) repeatedly, while trouble shooting the problem, we've noticed that in the DNS zone, under _msdcs we still have all the entries for the demoted domain controller, aren't these records supposed to be removed in the demotion process? Should we go ahead and delete them manually? Should we expect any problems in the upgrade process because of these entries?

_msdcs DNS records for a demoted DC

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.