Failed Demotion of 2008R2 DC

I migrated from a 2008R2 DC to a 2016 DC.  All FSMO roles moved successfully.  All queries return the correct values.  When demoting the 2008R2 DC it fails at "Active Directory Domain Services could not transfer the remaining data in the directory partition DC=ForestDNSZone...... to the new 2016 DC.  If I run a cmd for dsquery fsmoroleowner, it shows an old servername that was in place long before I acquired this client, possible failed migration.  I have scoured the DNS and ADSEDIT and found noting referencing this old DC name.   I am unable to find the old DC how should I proceed?  Manual removal of the current 2008R2?  How should I proceed?
averylnAsked:
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Britt ThompsonSr. Systems EngineerCommented:
You'll need to run a metadata cleanup using ntdsutil - https://www.petri.com/delete_failed_dcs_from_ad - also, check AD and AD Sites and Services to make sure the computer account doesn't still exist
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Joseph HornseyPresident and JanitorCommented:
Check out my post here from a few days ago.

Basically, follow the same steps, but look for your old server.
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Seth SimmonsSr. Systems AdministratorCommented:
I have scoured the DNS and ADSEDIT and found noting referencing this old DC name.

you opened the DomainDNSZones context, looked at the properties of CN=Infrastructure and fSMORoleOwner attribute shows a valid server?
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Joseph HornseyPresident and JanitorCommented:
Question satisfactorily answered
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