update – so after taking a closer look at my sauder job, I cleaned up tr21 sauder and retried – it worked – kind of. First, the standby light stayed on, and the slide engaged with the gear/motor (could no longer be slide manually) and if I hit a cd button the led showed me the cd# and the light went on, but the slide was not moving – also the glass motor kept going up and down (glass was still off). After a few minutes it shut down again. TR21 was shorted again??? Any suggestions now, why tr21 keeps blowing?