Grrr.... I was attempting to replace some dimming lamps in the meters, and accidentally tapped the long skinny board, with the four top lamps, against the main heat sink. Saw a spark, now no bulbs light or meters work. I replaced and checked bulbs. Perhaps a transistor blew? I only see a main fuse in the back. Are there others? The amp section is still working, as I can measure DC offset and bias, which aren't too high for the relay to not engage. Thanks for suggestions!