[drh4683]

Yes, check that audio board and look at the degaussing thermistor. The thermistor is the carbon disk about 3/4" in diameter with the exposed leads that are soldered on each side. Since you had the chassis out, it takes nothing for one of those leads to break free if not both and the whole disk fell out and is now shorting something to ground elsewhere above the chassis. Take a look and see if that thermistor is in place. If so, then id also guess that a solder blob is shorting something out. Im curious why the circuit breaker fails to trip? Those can go bad too though.