I've only worked on outstation operations (primarily freight - but even my most illustrious contract, British Airways, was handled by contracted United maintenance guys) so I've never even seen a maintenance hangar outside of school.
I tell you, every time those hot shots came into town to get us straightened out, I've never seen anybody even think about being less than super grateful and accomodating (our regular line crews may have had a little wounded pride maybe--but they were never rude).
Do you suppose that egos get going at a time like that with some of the trickier or elusive problems?
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Un diva très doué.