on T3 I have all column 6 switches not working 41-46 on sw matrix so the rpg is not registering anything on the target switches and the top right orbit switch , I had transistors q6-q7 missing on the I/O power driver board so I replaced them, also had resistor r428 burned on the cpu sound board, I replaced it, still not working , any advice on what I need. thanks for any help