So, just wanted to play one game of Funhouse before going to bed tonight and low and behold a problem popped up (isn't that always the case).
Starting having an issue with the center trough switch not working. Went into switch test and actuated by hand and it remains open, so I then hooked up the multi-meter directly to the switch for continuity and it tests fine, open and closed with manual activation. That rules out a flakey switch issue. I then test the diode with the multimeter and it looks fine (assuming I'm testing correctly).
I'm left scratching my head as to what to look for next, if anyone can point me in the right direction it would be much appreciated.