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Thanks for all the great advise, Success at last . The problem occurred after re-ruberring the machine. New replacement rubber behind the drop targets had pulled the contacts together. Machine now scoring correctly & pop bumpers seem to be ok? I dont know how the switch behind the drop targets could cause pop bumper probs? maybe a coincidence. By firmly bumping the playfield i was advancing the score & when activating drop targets manually, i was getting unusual score advances of 200, 500 & 700 for different targets. Thats what led me to that switch.Something so simple caused so much chaos! Here's to a great team of problem solvers.