I noticed some water in the shower after a rain. At first I assumed it was from some pin holes on the roof. That will be another project.
Upon further inspection, I think the water was coming from a leak in the rear window. My old friend google informed me that RV windows should be resealed every so often. I also learned Butyl Tape seemed to be the best product to use as a replacement sealant. So I measured all the windows and ordered what I needed from Amazon.
A couple of helpful videos for resealing the windows:
So here are some images of the water and leak:
Bathroom window outside 
Bathroom window outside, close up. 
I suspect this is where the water is coming in. 
Window removed, old sealant 
Removed window. 
Removed windowed, cleaned. 
Cleaned frame. 
Window reinstalled, new sealant oozing out. 
bathroom, reinstalled. 
Window installed, close up. 
Another window. 
more old sealant. 
Even more sealant. 
Side window hole. 
Second window, close up, new sealant. 
Another close up of new sealant
I ended up resealing all 5 windows. I need to let the sealant settle in and the go and trim the excess butyl sealant. I also replaced all the screws with new stainless steel screws. It was a lot of work to clean the old sealant off the frames and fiberglass siding. A scraper, elbow grease and acetone did the job.
I will update this post with some photos once I trim and clean the excess sealant.
