Do you have a DBT? Watthour is saying the output transistors are not conducting and no current is flowing through them. With the receiver on the DBT. Volume turned to min/down and no inputs. Clip the black DMM lead to chassis and the red probe to pin 24. Adjust the idle trimmer from full CCW to CW and watch the DMM for DC voltage. Return the trimmer back to min, full CCW. The range is from millivolts to a few volts. Then clip to pin 28 and perform the above procedure once again. Record and report. You can perform this procedure to the good channel and see for yourself the differences. Easy on the trimmer when going full to full idle. It will open up the outputs. Just do enough trimmer too see the good side working correctly. The procedure is checking the driver circuit.