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Hi Rod,
If scope.exe loses control of the switching, the full current that the supply can give could go through the board and to the motor(s) and the weakest link get's a workout.
Have you tested that the motor is OK? Try swapping it with the other working motor. You say that the motor buzzes, then I guess that some of the trannies/coils are OK, otherwise if it was completely dead, then all the trannies/colis have been nuked.
If you need another board or motor, just shout. I have a spare.
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