Tonight I finally got started with the window removal.
First check out existing seals.
Butyl tape and a bead of caulk on top. There are 2 places where the butyl was used. Between the coach wall and the outer frame and between the outer and inner frame of the window. Removed all the outer screws attaching the 2 frames and the screws holding inner frame to walls.
Then start gently prying and working it apart.
Had to cut the wires for the power window. But first be sure to roll the window down. Needs to be down to change the wiper seal that was the main source of water intrusion.
Ands now fully remove the window. As you can see this was done without removal of the seat. There was plenty of room to access everything.
With the window out I can see that there is some punky spots on the floor. It is mostly dried out and appears to have been there for a while. The new sub-floor a PO installed for the vinyl tile is still in good shape. The drain hole also shows signs of water getting into the floor. Since our coach is parked on a slight grade most of the recent water leaking was towards the back of the window.
And now the point of failure. The original drip pan. This pan was a mistake in their design. Material is too thin and tightly fitting. The constant movement cracked all the corners. The PO tried to caulk and put Eternabond on it but without fully removing the window you are just putting a leaky bandaid on it. The drain tube attachment is also poorly executed as 2 small screws and some butyl was used this leaked also.
And now for the replacement pan. .040 aluminum welded corners and a welded drain.