I'll chime in here, yes he has the full manual and schematics for this game (i am helping with the electronic/ electrical probs).

There are a few electronic issues that i will do my best to sort out for Ian. There are issues with the displays, all digits coming on dimly when the game has booted up (ones which should be off), as well as some feature lamps coming on at the wrong times, suggesting to me lamp data/addressing problems  
Not sure if the lamp and display problems are related just yet, need to study the schematics some more next time i visit Ian. I have a few ideas of what might be wrong though.

I have worked out and fixed a few things on this pin already when i visited him last weekend... rewired the coin door (EVERY wire was cut off the switches etc)   and repinned some of the connectors that were hard wired to the driver board, (replaced header pins on board as well as connector housings), still have a few to do as i ran out of time.

 Its going to be a pretty good game when its done i reckon, i hadn't seen or played this title before.