Ohhh man!..........Ohhh geeezzz......... I'm sorry to inform you that it's not good! When that happens it's the first sign that the rest is going to burn up soon!! It can't be fixed! No good, Kaput!!!!
But if you act now!!!! There's hope!!!! I'd take it 4 hours south, and unload that thing to a guy in GA, trading it for whatever you can get!!!! Even if it's something as useless as a Rough Black Hole back box!!!
I'm joking! (Just in case anyone thinks I'm serious.)
Sry, I'm no help.....I'm still new to all of this...I did try to find a schematic online to see if I could even figure something out? I couldn't find one. I'll look a little more. I do.....Have a few spare parts if anything from the lower cab is the same as Black Hole. If your referring to the round glass(?) things in the lower cabinet as resistors? I may be mistaken but I think those are a type of fuse. I may be wrong on this! I'm going off of cloudy memory.