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My S-class had same problem and motor drive was in rear left boot at
side of wing. I had a spanner in tool kit supplied with car to operate
manually if roof failed. I wound the roof back with this and after
removing trim could get a bit of grease on the drive cable with a
small screwdriver. It then operated ok so I put a bit more grease on
in different places and it has been fine since.Best advice is to fully
open and close once a week even in winter as mine had not been used
for 6 months and had evidently seized up.Check history on this site as
others may have had other problems if something else has gone.
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