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Have never heard of the supply side ductwork collapsing but that doesn't mean it can't. If you can get one of those cameras on a cable that attaches to your phone you can pop the supply vents off and look up there to see if somethings wrong. The vents have three indentations on them and you can gently pop them off and back on.
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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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