I have a 2720 SL. It is closed up right now in the garage and I have never looked at the furnace. I am not sure exactly what all you did without looking and am wondering if any of these problems you described might pertain to my trailer..
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Roger and Patty 
TM:2006 2720SL
TV: 2010 Tundra w/ tow pac.
Dealer Options:swing tongue, sink cabinet, awning, air conditioning, tile
Modification: 15“ tires & monitor system, WDH, Prodigy B.C., 2-6 V. batteries & clipper monitor, LED's. Additional modifications can be seen in albums.
Pictures of campsites and places we visited can be seen at https://www.flickr.com/photos/101899116@N06/sets/.
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