I would try taking the bedroom floor vent off and putting your phone camera down in the duct and face it towards the front, take a number of pictures with the flash on.
If you do not see any thing, take the floor vent off by the kitchen where you have air flow, put your phone camera down in the duct and face it towards the back, take a number of pictures with the flash on.
When taking the pictures you may even shine a small flash light down the duct to light it up further down than the camera flash.
You may be able to see the restriction / blockage.
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Robert & Sheryl
2014 Redwood 38FL
MoRyde 8K IS, Disc Brakes, MoRyde Pin Box
17.5 Goodyear G114's, RV Armor Roof
2018 RAM 3500 DRW, Curt Q24 Hitch
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