I recently took my Genny in for its first service, and I mentioned the rattle to the service advisor. After checking things out, they could not reproduce the rattle noise (coming from the passenger side, I believed it to be coming from the passenger door), go figure. So I asked advisor and tech to go for a ride with me. After finding a relatively bumpy area, voila, the rattling began!! After about 5 minutes of trying to isolate where the noise was coming from, the tech found it around the front right corner of the sunroof (when tech applied some pressure with his hand around the sunroof area on passenger side, the noise would disappear). He said the sunroof mount may have a loose screw or something. They did not have a loaner for me at the time, but I will be taking car back in soon, for this to get fixed. they will need to remove the headliner, and I am hesitant about that as well, but the rattling noise drives me nuts when I am driving low to moderate speed and the car shakes over a small bump or brick pavers, so it must be done. I wil advise what happens once this is fixed (in about a week or two, since I will be travelling).