The panoramic sunroof and shade may stop working on Mercedes-Benz R320 CDI

The panoramic sunroof and shade may stop working due to a broken sunshade drive/guide.

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Average mileage: 63,160 (48,320–78,000)
2 model years affected: 2007, 2008
5 people reported this problem
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problem details
2008 Mercedes-Benz R320 CDI 78,000 mi,
My rear shade wouldn't open
2008 Mercedes-Benz R320 CDI 48,320 mi,
shade will not close