I have a 2003 Phaeton and just finished replacing a window in the large slide. You will probably have to take down
the valance, I had to/take the night shades down with it to eliminate other problems later). The only thing I did was removed the screws on the inside and carefully broke the seal/caulk around the top of the window. There probably is no sealer around the bottom. I got a good silicone caulk used it sparely and sealed the new one the same way. Sealing only the top and about 1/4 of the way down on each side.
One thing to be careful with is when you put the window back in and start to tighten down the screws be careful as you can twist these off easily. It was an easy job to do.
I would check with the factory and get cost on new windows before I paid somebody to rebuild them. Warranty etc
D.C.H. 2003 Phaeton
