I am working on an SX-1250. When source is set to Phone1 or Phono2 there is no sound in the right channel. All other source settings work as they should. The turntable and cables work fine when running through another amp. What should I check first? BTW, all electrolytic caps and transistors on the AWF-021 board have been replaced. All switches, pots, and jacks have been cleaned with deoxit. I double-checked to make sure there were no backwards caps, and that the transistors were in properly. Seems like a potential bad wire connection issue. However, all the wires from the board appear to be properly connected.