Hey Vic, I think we've hired some of these same guys over the years. What is it about not wanting to give the vehicle back? We've had guys quit and just leave their work van in a random parking lot. Or if they get fired, they take their van home unwilling to return it.
I have to say, we've been pretty lucky with the mechanics the union has sent us recently. I'm hoping this is the new normal and were not just lucky.

Broke_Sheave, you couldn't have said it better about putting the extra effort to take the prints home and studying. Every Trouble Shooter I've ever met did just this and has benefited from it.