Glass sun/moon roof
 

I have an issue with my power sunroof. It works fine to open and then to close, but it seems to close too far and pulls the corners of the glass about 1/2 inch too low. This flexes the glass and I am afraid it could break it. Is there a stop adjustment that I can adjust or would I have to take it in to have it adjusted to close and stop flush with the roof of the car ?
Any and all help will be greatly appreciated.
Thanks.