Check out my recent thread. I had this happen this summer and the fix was no big deal...and yes, my sunroof doesn't get used that much either...

http://www.peachparts.com/shopforum/showthread.php?t=98487

__________________
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car