RV Repair: Window Leak, visible evidence, storage space

Question
Dave,
We have a 1989 29.8' Jayco 2950 FK DB Jay Series travel trailer. The wall in the back of our trailer behind our bed is rotting out due to a leak that is coming in on the right side of our back window. How do we find out where it is coming in so we can stop it and then put a new wall in. It runs into the tray around our right solid window beside our turn out windows and when that lip gets full it has run over or it seeps down into our wall. Our storage space below our bed is ok. It just seems to be contained in the wall behind our bed. I put a rag in that window and it catches the water but we realized this too late. I found out it leaked into our wall when I was making our bed and my hand hit the wall and put a hole in it. Could sure use you help. Thanks

Answer
You will need to remove the window in order to tell where it was leaking.
There are probably 2 places where it could be leaking....
One possibility would be the rubber "glazing" that holds the pane to the frame. This can get old and brittle and it doesn't take but a tiny leak to cause a lot of damage over a period of time.
The other posssibility would be the seal that is between the window and the wall. Usually there was an adhesive "bulb seal" that was stuck on the back side of the window before the window was screwed in. Then when the window was installed, this creates a seal between the window and the sidewall.
It sounds like you are going to have to tear apart the wall and replace some paneling, so you will probably have to remove the window anyway. At that time there should be
some sort of visible evidence as to where the leak was.
When you reinstall the window, make sure you seal all the way around the edge with some silicone caulking.
Let me know if you have any more questions.
Dave