We had that problem on both sides of the slide. Recaulked the top of the 4" trim peace and it stopped. Started again this summer. Went out and checked, caulk was old and cracked. Pulled the old caulk out and replaced it. Two nights ago pouring rain and 50+ mph winds blowing directly on the slide. No leaks, although very tough to sleep.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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