My brother is resurrecting a Buccaneer , we have managed to sort out multiple issues over the phone and have got the machine working correctly for 4 balls or 2 balls on the 3 ball setting. When the LAST BALL is in play the roll over switches score as they should but the weird thing is the right flipper pulses 5 times in conjunction with the score advancing.We have traced it back to switch 1a on the score motor . If you close this switch manually when game is on last ball only it activates the flipper but does not add score. Any ideas?