I blew two 2SA747 PNP transistors and a few other transistors on the driver board by being careless when I was setting the bias and using a steel screwdriver.Anyway I replaced the original outputs with a set of MJ21194 that I had pulled from a pro amp and I ordered 4 new MJ21193. The thing is when I measure the PNP the new MJ21193 tranys the DMM reads they are shorted on the emitters but only when the heatsink module is plugged into the driver board? Ive checked the driver board over and over but cant find anything wrong.Same with the outputs and heatsink module.Ive pulled it apart but found nothing that would cause a short? The short seems to be coming from the base to the signal output to the relay. Its the same with nothing plugged in from the outputs heatsink module. The strange thing is it will come good on one channel and go to the other channel, the PNP outputs will short there when measured on diode setting with my DMM? Ive attached a schematic to show what Im measuring when its shorting. As I said,the transistors are OK until they are plugged into those two red cross marked paths and I measure from Base to Emitter? Base to Collector is OK.Now its gone over to the other channel and it shorting on the emitters on both PNP and NPN? Ive used alligator clips to isolate the two pins that were shorting? This has got me completely stumped? Heeeeelp!!!!!