Go into the test mode and check that all switches are working - especially when you know the door coin switch will not work. Check any 1000 point switch (I think the DT's are 1000 points each).

Also refit the connector from the door to the cabinet loom.

I'll check those switches. Do you know which connectors might be involved in the intermittent start-up in the backbox so I can start repinning there. I've repinned A1J2, A3J4, A2J1 & A2J3 so far.