Missing transformer, unit is good for parts. Good main filter caps, Bad sub power supply. We can supply better quality relay but must be hand wired into board. Back Panel speaker panel $20. Both left and right modules have been tested and are guaranteed good. Easy pull and install. Right Module amp $120, Left Module amp SOLD. Note: Relays in these units are notoriously bad and noisy. This may be mistaken for bad modules. Unit has seen low use time.