This is such a strange problem with certain Ultraview's . Mine is in the shop now for 3 day's and the creak is still coming through! To the Cadillac dealer's credit they are trying everything to pin point the problem and they do not want to let the SRX out of the shop until they find a fix.
An associate of mine purchased a late build '04 with Ultraview and has no creaking. I think it has something to do with the Dupont adhesive used to install the ultraview. Yes, they are glued onto the frame...