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The bad resistor is on the ps board that drives the display, well on mine at least. The resistor is supposed to be 10 ohms at 1/8 watt "i think" i replaced it with a 1/2 watt resistor. Either way its R9310. the board is right behind the display on the right side just behind the volume knob. when open and looking from the back you see it just fine. it's not hard to get out. fairly simple to fix.
You will need the schematic. Resistor values are sometimes forgiving but a resistor will burn due to an excess of current caused by something else in the circuit. So even by replacing the resistor you will not necessary solve the problem but you can try. Schematics are often found for free on the net. good luck
Probably need to rebuild bad amp channel. Look for burnt resistor and rebuild that channel. if you plan to do it yourself let me know which channel . i can get you part numbers. Check big white resistors . Value should be .22 ohms. If open then thats your bad channel. Check outputs if they read 0 accross any leads thats the bad channel .
After much frustration, mainly from working with mainly unreadable prints, I was able to locate the source of MY problem :
There are two .9 ohm power resistors on the power supply board. They are responsible for supplying AC to various motors and relays. One of them was burned open and the other was reading 250 times what it should have. I replaced both of them with 10 amp inline fuses for now. Radio Shack sells 1 ohm 20 watt resistors which should do the job. IDK what the reason is for the low value resistor.
If the resistor has been completely destroyed, look on the board for the circuit designation (eg. Rxxx). With that someone with the service manual or access to teh schematic can provide the value and wattage.