The vents under the stairs are the return air for the furnace. Our old rig had those and I always put black foam board behind them in the summer and took it out in the winter. When I've had a plug that wouldn't come out I've had to wiggle it up and down while pulling backward to get it out. If yours has a ring that screws in on the top, make sure that is all the way unscrewed.
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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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