Mine jammed open (one side only) about a month ago. My local mechanic was able to get it back down but it is permanently closed now. Oh well. He said replacing the cassette was thousands of dollars!!

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2005 X5 3.0i
2003 530i Sport (former)
2014 Audi A6 TDI Prestige (daily)
2018 MB C300 Cabriolet (wife's)