Active Directory Lightweight Directory Services identified a critical system object on the local domain controller as a candidate ...

Windows Server 2008

Active Directory Lightweight Directory Services identified a critical system object on the local domain controller as a candidate for deletion during the lingering object removal process. This object had been deleted and garbage collected on the following source domain controller. 
 
Object: 
%1 
Object GUID: 
%2 
Source domain controller: 
%3 
 
Active Directory Lightweight Directory Services will not delete a critical system object even though its deletion and garbage collection was identified on the source domain controller.

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