8 years as an electrical/mechanical maintenance technician, 5 of which I've spent at 3M. The first 3 were at Johnson Controls, worst job I ever had.
Got into maintenance as I'm a single father, needed to stay home with my son.
I was a foreman/journeyman electrician with a major electrical contractor before this, and I miss it. It was a very satisfying job, big kick to the ego, lots of fun, even the travel was fun.
Now with my son about to go off on his own, I've contemplated a return to electrical construction. Not until we get out of this recession , though.
Every job I ever had, the single biggest problem was bad management, or micro-management. Back-stabbing is the #1 occupational hazard in America !