Lift the louvers and push down on the plastic body along the lower edge of the rear window. It's not uncommon to have the lower edge of the rear window come 'un-bonded' from the body. If that's the case it'll be apparent when you push down on that area of the plastic body. If it is loose you'd be surprised how much noise that allows into the cabin area. Resealing with a silicon RV sealant is easiest. The only other alternative is removing the window and re-bonding and is probably unnecessary. Bruce Benson > > What other noise abatement controls have other owners done to reduce passenger compartment noise?