Hi Joe
I just went through this on mine. The tech asked if both sides come through the eaephones. If it does, it is a good sign, although it took hime two hours to fix mine. I quess if it didn't, it would have been worse. In my case, 5 transisters were blown.
Of course, it could be a simple loose connection to the speaker. In either case, it is no simple matter to get in and out of this beast.
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pa4X 76 ,SX900, Hammond SK1, Ketron SD40,Ketron Event X Centerpoint Space Station, Bose compact