I have a newly acquired Williams triple action machine, unit will turn on when plugged in switched on and left flipper pressed, but then nothing. Tripping the coin lever something energizes, but no ball is loaded. Score shows all zeros, no tilt warning is on, but the ball count never changes. I have set the spinner things in the back board to their start positions. I do have the original wiring diagram, and instruction sheet that were in the machine, but I’m used to read automotive wiring diagrams so I’m a bit lost. Looking for some insight or tips on what to check/test next, where I should have voltage things like that.