If you don't have any vents open on top, ie kitchen and bath, then your experience would lead me to believe that you have a split top seam on the tank, leaking blade valve that let's poo juice into the belly, inlet pipe issue, or you are getting odors into the attic and ducts via a slightly open ac seal that only let's in highly condensed odors like black tank honey. Happy hunting. John
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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