This is a pretty cool game to play  now that I have fixed all the faults .
 After the 1st couple of games I realised there were problems.
Because most of the features rely on either a set of 8 relays, or another set of three (the number matrix) to trip the respective feature relay you need a lot of switches to be clean and adjusted correctly.

Examples .
To spell out S P E C I A L means 8 relays need to be tripped and an earth passes though 8 sets of switches to the relevent feature relay .. found a number of switches either out of adjustment or dirty on most of these relays, which meant game wasn't paying out for completing special etc.

To get a payout for 3 numbers in a line means all switches on a set of 9 relays need to be clean and correctly adjusted.
Game was paying out for 3 not in a line , eg 1,2, 5 or 2,5, 7 etc and not paying out from some lines of 3.
Found switches closed instead of open on 3, 7 and 8 relay as well as other dirty switches stopping payout for spotting corner numbers .

There were a number of other faults too due to out of adjustment switches

eg. ' On Bumpers' feature didn't work because
a) both target switches that light the bumpers for 100 pts instead of 10 were way out of adjustment + there was no earth for the hold cct for the on bumpers relay because of a NC switch on the eject relay was open.




Its also fun fault finding all this without a schematic .