Does anybody own, or understands the Sunroof of a 1977 BMW 530i?

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hansfrinkle

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It's very odd, my BMW 530i (1977) sunroof is malfunctioning. It is stuck in the creaked position. When you press the electronic button, she hmmmmmmms, but the sunroof does not move. I have tracked the humming to the back, and have personally watched a nut rotate in the trunk. Does anybody understand, or could help me on understanding this system.
 
its one of the servo's, take it to a mechanic
 
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