You shouldn't find anything by going underneath. What you need to do is take the wall out of the basement. Not a big deal just some screws and then you should be able to get in there and see what is happening with the duct work. Usually, it's coming off the connection to the furnace itself.
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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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