My Black Knight won't start a game. I am pretty sure it is because the ball trough switches are not registering. Testing diognostics on the switches revealed that none of the ball trough switches work. But I am getting multiple identifier codes on most of the switches. My understanding is if this occurs on all switches in a row then there is a short in one of the columns. However I am getting errors on every row. Would there still be the possibility of a short or should I be looking at the transistors in the mpu?