Studio Spot 250 - Gobo wheel motor not working?

The Litho/Gobo wheel on my Studio Spot 250 isn't functioning properly. I can feel it "clicking", and it is gets pretty hot. I've tried switching the motor with one from another studio spot that works, and it does the same thing, so it can't be an issue with the motor. Maybe some kind of logic board issue? This only happened about a week ago. One day, my two studio spots just started acting erratically in the middle of a show, and I couldn't regain control of them.
Anyone have any suggestions about the motor issue though?
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