Hoping someone can point me in the right direction. I keep blowing Q47 on the main board. This little beasty via the switch matrix controls a few things including Flipper e.o.s , troughs , left and right kicker and play field tilt. I have checked for shorts and cleaned all switches. When I replace Q47 the game works for up to an hour, then Q47 goes short ...if i replace.......the game goes again for a period and then Q47 craps out again. It is driving me bananas! Cheers