These things are a PITA with not resetting sometimes. I've found quite often you have to hit manual reset then cycle the power to complete the UCM reset.
Did you try clearing your PF RAM? I always try clearing PF and SAC RAMS as a first step for odd issues. Be careful, SAC RAM stores security setup. Don't clear if your car has security on it.
Is there any shutdown faults(active faults)? M-2-2-1 it's the option that says shut I believe, option 2 is event log.
Whats the mode it's in if you look at mcss status screen? M-2-1-1.
Another thought is did they trigger the "got on the cartop wrong" lockout? Can't remember what they call that but I do remember reading one way to clear that is to put it on fire service.
