Good news, i hope the diode solves your other ploblem.
cheers Ian
I managed to find some diodes (knew I had some somewhere) and all good. The machines working just as it should now.
The diode was around the right way it was just the wring that was wrong.
The boards are heading up to Beaky this week and ill change a connector on the sound board which has been playing up a little and that will be it for this game. That is until Flash Gordon is finished then Xenon will get a full restoration.
Thank you to everybody who offered advice and pictures to help me get these problems sorted, it was greatly appreciated.