Small update
I've been trying to work out why the hold relay wasn't latching on.
After studying the schematics I decided to trace the wires, turns out that the hold wires loops to the coin lockout and one of the wires had fallen off.
I thought it strange that it would be done like that, anyone have a reason why?
Anyway now it is resetting, and I can start a 1,2,3 or 4 player game.
No chimes yet and some of the score reels are not carrying over to the next reel when they hit 9
I also have rebuilt the coin unit, it was really gummed up but it works smoothly now