Based on our experience with three Montanas, after I looked at the plumbing, I would check and see if you have about a 4" plastic strip that runs along the outside of the slide. If you do, clean and recauk the gap. That area, while it looks like it couldn't cause the problem, always has been the cause.
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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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