I was browsing the TIS and came across a Service Information bulletin that relates to the amp overheating and shutting down, then coming back on after cooling off. Apparently, the amp mounting bracket interferes with the cooling fan opening.

This was supposedly corrected in June ’97, but, if you’re having this problem, it might be worth looking at the mounting bracket to see if there’s a 1.5 inch hole in the bottom flange, opposite the fan opening.

If you do have the hole, perhaps the fan is not working.