Does anybody service PTAC units (hotel style A/C) in BR?

The PTAC unit in my home office/beer room crapped out during a thunderstorm last week. It won't power on at all (AC, heat or fan). I'm having a helluva time trying to find anyone that will call me back, much less come look at it to repair. Everybody I talk to either passes me on to someone else, who they assure me works on them (which they invariably don't) or doesn't bother to call back.

I imagine it's probably in need of a new main power board or capacitor. But I don't want to start ordering parts off the internet when I don't know what the true problem is.

FWIW, it's a 2005 G/E Zoneline model #AZ28E15DABM1. Parts don't appear terribly expensive, which is probably why nobody wants to call me back.

Anybody know someone or can point me in the right direction?