didn't have the same problem you are having with the opening and closing, but the sunroof seal was replaced then the whole cassette (both under warranty) because water was running down the interior A pillar.

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2004 BMW X3 3.0i - 2/08
2004 Nissan Maxima SE - 4/07-2/08 68k
2006 Nissan Pathfinder SE - 12/05-4/07 36k
2003 Ford Escape XLT - 10/02-12/05 70k
2000 VW Jetta 1.8T - 7/00-12/05 - 130k
1997 Honda Civic EX - 2/97-7/00 - 95k