Onkyo Receiver dead channel


I have an older Onkyo receiver, model TX 844. There is no audio output from the right channel, for either set of speaker terminals or for the headphone jack. I have located only one fuse, on a board directly behind the front panel power switch. Are there any other fuses that should be checked, or any other known or obvious issues with this I should look into? Or is this now a tree lawn item? Thank you!
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