Roof won't open/close correctly on Mercedes-Benz SLK32 AMG

Position switches for the vario roof can fail, causing the roof to stop in the process of opening or closing.

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Average mileage: 51,500 (6,000–97,000)
3 model years affected: 2002, 2003, 2004
5 people reported this problem
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problem details
windows go down but top doesn't move. Can hear motor whirring.
roof will not open , flicking roof switch eventually opens windows but nothing else, relay on pump ok