Hi, I just posted this morning about the same thing and my top is idential to yours. Did you ever find out what caused this. I had mine to the dealship one month before my warranty was up and they denied a new roof because they said it was a scuff mark and that I had to have draged something over it or a tree lim or something hit it. Knowing that this was not the case I have been searching for an answer. I have tried lowering the top at all different times but just can seem to find anything.