Bumping this for some more knowledge from neutrino @neutrino. All my lamps have gone out on my middle earth, but the game plays and scores as normal. The score displays work, however all the lamps are out.

I checked the fuses, they are fine, however all the transistors including q5 are cold, and im used to them being super hot. I checked voltage into q5 and it appears to be 25v. How would i go about checking the transistor? It feeds into the other 4 transistors and those are also cold and im assuming thats why all my lamps are dead.

Failure mode was simply turning on the machine one day and no lamps came on in attract mode.