The image below is of the left interior side of the trunk of my 1991 300SL. When the soft top is operated there is a BAD leak were the arrow is pointing. How is this repaired?

Here is the link: http://forums.mbworld.org/forums/showthread.php?threadid=40725

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1973 280 - Sold
1980 300SD - Sold
1982 240D - Stolen
1988 300E - Sold
1989 260E - Sold
1989 560SEL
1994 E420 - Sold
1997 E420
2005 CL500