Thanks Shane
The 'O' relay is my problem. It remains energised after 'Game over' keeping the right flipper alive to enable score motor operation and another ball launch. Looking at the schematics power should be stopped thru the '6th position' contacts in the ball count unit. We discussed this unit earlier by phone and I beleive something may be wrong. I'll attach a photo of the unit and test voltages at the contacts to make a comparison.
Greg