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Hi, even though the mains fuse on back of amplifier is fine, the speaker fuses might have blown. Now really you need to take it to get repaired but if you know someone who has electronics knowledge they could look inside the amplifier to check the speaker output fuses. I wouldn't want to advise you to do it as there are dangerouse voltages inside the amplifier. If you need more help, I will guide you.
There are many variants of this amp depending upon its age. The fuse will be a ceramic one that should be solid white and be around 10A or more. This will be about 1-1/4" long and located inside the amp. Remove the top cover for access. It will be in a fuse holder. Please make sure that the unit is unplugged before opening.
Most likely the amp for that channel is defective. If memory serves me correctly, there is a small amp chip mounted on the heatsink that is for both the left and right rear. I would change that first. It should have about 5-7 pins.
This is usually caused by a blown fuse or a blown capacitor. The fuse would be cheap and easy to fix, the capacitor would be expensive and replacement would be my choice. If you are pretty handy with electronics, unplug it, take the cover off the unit, and look near the capacitor for the fuse. Check the fuse for a break in the wire inside it. You can get these fuses at Radio Shack. Hopefully this is what it is, and will be a cheap and easy fix for you.
Let me know how it goes.