We had three different leaks, all from the slide end wall windows, and all were leaking from a very small gap between the window frame and the outside wall surface. Instead of just replacing the butyl or putty tape, which would have just eventually failed like the first time, I used black silicone caulk and ran a bead around the entire window frame after I removed the excess tape that spread out beyond the metal frame. We have not had any other leaks since doing this. The only thing I can see that causes this is high temperatures in the summer and then very cold temperatures in the winter that creates much expansion and contraction that creates the gap. This may not be the most approved method of repair, but for me, it has worked well.
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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