Hey folks thought I'd post an update for future failures in case anybody else needs to troubleshoot. My guns were bouncing all over the place x and y would both bounce from 146 down to 138 or so then repeat back at 146 going left and right ... same occurred with up and down, completely random numbers. In game it looked like my guns were just shooting up into the corner of the screen, wouldn't hit anything. After swapping every chip on the Coil/Lamp board, changing out all 4 pots in both guns (expensive) and tracing back all wiring it looked like my issue wasn't coming from the guns OR from the board. Tracing back further I was able to find my fault on the main PCB. Chip U103, SN74HC541N - a 3-State Octal Buffer. If anybody else has an issue like this and they can't find the fault on the Coil/Lamp Driver board try to start probing in the U105/U103 region on the main PCB (area near the 2032 battery). Hope this helps anybody who might be stumped with a similar issue. Circled the bad chip and supplied a pic of the chip needed to get the guns up and running again.