All right; the TZ is still down as of today. I'm having a problem with the bottom lamp row; the start button, Ball lock 2 (door), the green lock insert, etc.
I have replaced transistor Q83 twice now. There is no way I've had 2 (er, 3) bad transistors in a row. And my soldering skills aren't great but I'm certainly capable of removing a through hole component and replacing it.
I am totally stuck as to what else this could be. The symptoms clearly indicate the transistor is shorted... but is there another possible explanation here? Could a diode down the path be shorted instead?
I have not changed any bubs, nor basically touched this game in months now because of this issue. I'm two steps away from buying a backup Rottendog and sending this out for repair.