If you live in the south Like Florida check your skylights. Here in FL we have had 3 days of heavy rain. So when I was checking on my TT today I found water in the inter liner of my skylight. Knowing I Eternabond all the seams I had a felling the water was not coming from there. When I got on the roof to check it out I found that all four corners were cracked to the center. After talking to my RV repair guy he told me if you live in Fl or really anywhere you should replace the outer shell of your skylight every 2-3 years. So I filled the crack with silicone and will replace it in a few weeks.