This was serviced by me. I replace most of the caps on the main power board with new Nichicon Audio grade

caps. I also test the old ones and the new ones. No guesstronics is done here. New Green Leds that willl last

a very long time.

I dial in the factory specs for the bias current/voltage, and I also verify no DC voltage to the speakers. I usually play the

repaired unit for over 2 hours, then crank up the volume to verify the integrity of the output transistors.

These units are not made for 4 OHM speakers, so don't be an idiot like i Have dealt with before please.