Was the first day of spring so I spent some time looking at the pano sunroof to try to remedy the rattle. The rattle was noticeable when cold and seemed to be coming from the fixed rear panel. I also noticed that the rear of the fixed panel is higher than the front where it meets the tilt/slide panel. If you open the sun screen all the way, there are 3 screws on both sides. I loosened the front two screws (left the rear one tight) and I was able to lift the fixed panel almost 1/8”. Did the other side as well. Went for a little spin and no rattle. Gonna keep an ear on it for next couple days. Also going to look for leaks too.