Is this what you are thinking of?
Lid Cover contacting Roof
I also have had roof issue, from wearing, to the roof hitting the top piece above the window.Every time i took it in under warranty, my advise is don't mess with it in anyway that the dealership can come back and say you caused it and void the warranty. The roof is just to costly of a repair to take that chance.
I had a wear mark in the roof, when the dealership looked at it they found a clip in the holding area that was rubbing the roof every time it went down, I am sure if I messed with it they would have blamed me for the clip being out of place.
Good luck,