EventID 13, Server 2008 R2

I have a new 2008 Server that holds all the fsmo roles.  I am receiving an Event ID 13, that names an old Exchange Server that I had.  Where is it picking up this old server?  I can't seem to locate it.

Here is the message:  
Certificate enrollment for Local system failed to enroll for a DomainController certificate with request ID N/A from server.domain.com\mail.domain.com (The RPC server is unavailable. 0x800706ba (WIN32: 1722)).

This is followed by and Event ID 6:
Automatic certificate enrollment for local system failed (0x800706ba) The RPC server is unavailable.
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Michael PfisterCommented:
If there is no CA in your domain, remove the CA objects from your AD following


step 6 ff.

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Windows Server 2008

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