I heard back from Full Compass, I would have to order a new sub board with the USB port already mounted, $139.00, ouch! They recommended I by a used one for $399.00 at Reverb, with labor it would be close if not exceeding $399. I already located one here for $270, a great deal. When it arrives I will attempt disassembly, if successful I will order the board. One of our helpful members e-mailed me the service manual, I won't be out anything if I screw up disassembly. Hopefully I have just broken solder joints (a long shot) and won't need the board. Bob