Rob .. Never give up! Just think how you'll feel when its working .

Here's my 2 cents
1) As Daniel suggested out the score reel switches back the way they were
2) Before you turn it on again, set all reels to 0 and manually reset all steppers.
3) Turn it on and start a game.
As it is now, the score motor is still running because the reset sequence has not completed for some reason.
I've been caught out more than once where a stepper has not reset properly when I've hit the start button and the score motor keeps running as a result.
Cheers
Dave