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Swap input cables to the left side to verify both sides are clean. The power module for the right channel is probably toast. Or the protection relay for the right channel is very resistive.
The power module does not exist on the internet.
Go to Ebay, find a 100% seller, buy a M-501 for a good price, use your M-501 for spare parts.
unplugged with nO power cord connected,,after checking for any internal blown fuses, inspect circuit board for burnt resistors or blown caps, the resistors will appear to be laying on there sides and have multi colored bands around them look for burnt or discolored ones, blown capacitors will look like tiny barrels with lids a flat top indicates a good capacitor as any humped or bulged or rounded top would indicate blown cap , if not more than a couple you may be able to replace these with success, be careful always Unplug from power before servicing electronic componants.
EITHER blown caps or burnt internal fuses, look around on the circuit board for capacitors with rounded or humped ends, find and check internal fuses and test them
In looking through the service manual for this model, I see a Tone Switch that allows you to bypass the tone circuits, and it may be the one all the way to the left of your front panel. If that's not it, I would get out the owners manual and see what they suggest. I doubt that you actually have an electronic malfunction with your unit.
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