If they're anything like the units on the Toronado/Riviera from '86--'92, there's a known issue with them, the company that built them for GM screwed up on the parts selection. They are very fragile, and pretty much the same thing is wrong with all of them. Not an impossible fix, there's instructions out on the internet for reviving them using more-robust parts.
The original manufacturer used to "rebuild" them for big bucks, and installed the same crappy component that caused the failure in the first place.