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If you swapped the wires at the receiver, and the bad channel changed, that tells you that the problem is in the receiver itself. If it didn't change, then either the wire is bad to one speaker, or one speaker is bad.
How you power off the amp won't hurt it generally. I used to fix ONKYO amps under warranty, and I can tell you now, it will be full of dry solder joints. Take you unit to your local repairer, and they will resolder all the offending PCB's inside. This type of repair will fix 99% of strange audio noises and cutting in and out etc. for ONKYO recievers. Otherwise this is quite a good product.