Exchange 2010 Error Event ID 4030 MSExchange Availability

I have been receiving the subject event in the logs every 5-10 minutes. The details of the event are;

Process Microsoft.Exchange.InfoWorker.Common.Delayed`1[System.String]: Unable to find any replicas for free/busy folder EX:/o=MYDOMAIN/ou=first administrative group.

When I go into the PF Management Console in EMC, this schedule+ free busy folder does exist.However, going into the properties of the folder, most of the details say"Not available on this server".I think this folder is left over from an old Exchange 2003 install that was decommissioned over a year ago. Now that we are using Exchange 2010, there is another schedule+ free busy folder in PFMC that we actually use. 

My problem is that when I try to delete the unused schedule+ free busy folder, I get the following error;

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Microsoft Exchange Error
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Action 'Remove' could not be performed on object 'EX:/o=MYDOMAIN/ou=first administrative group'.

EX:/o=MYDOMAIN/ou=first administrative group
Failed
Error:
Cannot delete the object '\NON_IPM_SUBTREE\SCHEDULE+ FREE BUSY\EX:/o=MYDOMAIN/ou=first administrative group'. Please make sure that you specified the correct identity and that you have the correct permissions to delete it.

MapiExceptionPartialCompletion: Unable to delete folder. (hr=0x40680, ec=0)
Diagnostic context:
    Lid: 40487   EMSMDBMT.EcDoRpcExt2 called [length=61]
    Lid: 56871   EMSMDBMT.EcDoRpcExt2 returned [ec=0x0][length=173][latency=0]
    Lid: 23226   --- ROP Parse Start ---
    Lid: 27962   ROP: ropDeleteFolder [29]
    Lid: 17082   ROP Error: 0x80070005
    Lid: 19297  
    Lid: 21921   StoreEc: 0x80070005
    Lid: 27962   ROP: ropExtendedError [250]
    Lid: 1494    ---- Remote Context Beg ----
    Lid: 26426   ROP: ropDeleteFolder [29]
    Lid: 4887    StoreEc: 0x80070005
    Lid: 1750    ---- Remote Context End ----
    Lid: 26849  
    Lid: 21817   ROP Failure: 0x80070005
    Lid: 24721  
    Lid: 20625   StoreEc: 0x80070005

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OK
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When I go into ADSI edit; configuration, services, MS Exchange, MYDOMAIN, Administrative Groups, the only entry is Exchange Administrative Group for Exchange 2010 install. I believe I probably removed "first administrative group" object when I cleaned out all of the 2003 items in AD.

How can I delete this entry from PFMC when it no longer exists in AD?

Thanks in advance.

Brett