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the transtistors are mounted to a large heat sink. and yes all 4 main trany's need replaced. you can go to the library and look in sams photofact for the service manual. the part #ers are on the transistors. have fun and good luck again.
The problem you describe is common to JVC amps. This control has a motor mounted on the back of the circuit card that drives the volume control up or down using the remote control for this system. The looseness of the volume control cannot be repaired. The shaft has separated from the potentiometer. I don't know if JVC has this part any longer but it has to be replaced as a unit (volume control card).