Make sure the audio level on the left and right channels are balanced. Check the menu for audio levels to adjust and make sure they are not maladjusted. If all levels are adjusted properly then the volume control or volume control circuity may be at fault.
I have the same problem with this receiver. I should have suspected something when the first one I bought from Best Buy I had to return because not all of the 6 speakers were being driven when adjusting the 5.1 sound levels. I returned it and they gave me one that worked for several years. Then the front right and rear left channels started to fade. I think the output stages in these amps must be ****. I may try and take it apart and maybe replace some power transistors, don't know yet. Should have opted for a Denon I guess.
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I presume you have proven the channel is dead by trying multiple sources, swapping a different speaker onto it and that the balance control is NOT all the way to one side; headphones don't work either and we're down to proving it's dead before you take it in to a tech, right?
There is the slighest chance that a common control may have developed a high-resistance or 'dead' spot and is causing your symptom. Turn the POWER OFF and operate every control throughout its range a number of times, especially rarely-used ones like Tape Monitors and the Mute control.
If it still doesn't work you might want to prove if its a low-level signal loss or a high level amp failure. One way would be to run an RCA cable pair from the Tape Out to any other device (even a TV with speakers) you might have that accepts an audio input. If IT can't detect receive the DEAD Channel you
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