Mick, get Andy to come past, it will take him 5 mins to diagnose the issue properly onsite, and it will save u alot of grief, and save you from ordering a part which may not be needed.
Beaky can also check the IR board that controls the mini playfield, I know he has a spare onboard, and can also check his scources for any replacement part, and may not have to go outside of Australia IF his connection has some locally which he may be able to get over-nighted.
Theres plenty of help on the forum, but sometimes it can be easier to have a tech pop past.