This problem re-occurred on the weekend - I had my nephews over (8 and 12) and they were having a lot of fun playing the machine when it suddenly went hay-wire and started 6-ball multiball. Every time a ball drained, it would be ejected into the shooter lane and shot back into play. The youngest bloke was playing at the time and he was loving it, especially because he thrashed the top score! My other nephew had tears in his eyes from laughing so much. Of course it was hilarious, but the machine is well and truly up the creek. I think it might be time for me to get the professionals in, my passion fingers will only cause more problems than I solve 

Matthew