When we got the Allure, it had a crack in the sidewall extending from the corner of the slide opening down to the belt line. It was not straight....it traveled at a bit of an angle. I called Country Coach and they said they had some issues in that model with this and suggested I could get it repaired. I had a friend who does auto and RV collision repair look at it and he said that while he could re-glass the crack, repaint and have it looking new again, he could not guarantee it would not come back. His thinking (and mine) was that it was due to some stress/flexing and it just would crack again.
So, rather than spend $$$ on a repair that might not last, I covered the crack with a piece of 2" Eternabond tape to make it waterproof, then covered it with the chrome louver you see in the pic. It is actually two chrome louvers I got from West Marine. No one has ever mentioned it and it just looks like some sort of vent.