Have not done mine yet, have to call AMD as the game is randomly stopping mid game thinking a ball has drained. Any advise? Could it be the optos in the ball trough playing up? Will call them on Wednesday when i have a day off.

Mine was doing that and I fixed it on the weekend...

All I did was unplug and replug all the plugs for the opto and switches in the ball holder at the front.. There are two plugs plugged into the opto and a long (big) one with all that section plugged into it.. Pulled them all out and put back in again and the problem stopped..

Mine was occasionally thinking the ball was stuck even though it had drained and mid game would think it drained when it hadn't, so I lost flipper control..

Of course I am not 100% sure whether it was a bad contact or something else I inadvertently fixed.. lol.. but been fine since..