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powershell - wmi access denied issues

Last Modified: 2015-08-04
Trying to acquire disk information for a collection of 'supposedly' identical servers.  These were all built the same - all W2k8R2.
The wmi query works using my admin ID, however I'm trying to get it setup with a service account.
So, the same exact script executes fine with this service account ONLY against 3 of the 10 servers.
I've verified wmi/gpo/dcom permissions - they seem identical (though I can recheck any if requested).
What else could be preventing the connection to these servers?

I even attempted, as a test, to provide the -credential parameter and supply my credentials - that also failed.
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