Helping a friend with a close encounters gottlieb system 1 , brand new mpu , there are 3 or 4 switches out , I suspect a connector or broken wire somewhere one of the non working switch is the ball trough I don't have schematic for this game this make is very hard to troubleshoot does anyone can send me a pic of switch diagram or tell me what other switches are tide to ball trough switch and mpu connector pin that will help me a lot thanks