Exchange System Attendant does not have permission message found

Hello;

My domain has two Windows Server 2008 DC, one of my DC failed yesterday then I found the following error message in the Application Log of my Exchange 2007 server.  I am wondering why it is showing there, suppose even though on of the DCs failed, my Exchange should able to look at the GC or Active Directory information from another DC in Domain, right?  Two DCs has a copy of GC on server.  Please see the log below....

------
the universal security group '/dc=local/dc=company/ou=Microsoft Exchange Security Groups/cn=Exchange Servers'; the error code was '8007203a'. The problem might be that the Microsoft Exchange System Attendant does not have permission to read the membership of the group.

If this computer is not a member of the group '/dc=local/dc=company/ou=Microsoft Exchange Security Groups/cn=Exchange Servers', you should manually stop all Microsoft Exchange services, run the task 'add-ExchangeServerGroupMember,' and then restart all Microsoft Exchange services.