Yamaha m-80 power amp

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I have a Yamaha M-80 power amp. The trouble I'am having is the right channel is not working. The over protection shuts it down. Can anyone tell me if it's worth fixing? I also have a C-80 Yamaha Pre amp. The volume control you have to jiggle to get sound? Any thing for that one? One more Poineer PDM530 6 disc cd player.When you put the magazine in, and select play the disc spins but does not play? Help if you can I really would like to get these componetes working.
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