If only detectable when the fan is running I would check to see if you have an inline vent. If so, maybe remove and plug and run your fan to see if you still have an odor or replace the vent valve. They cost less than $6 at a HomeDepot or similar store. If you do not have an inline vent, make sure there is water in the drain trap. In both situations you may be pulling air from the Gray Holding Tank.
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Greg
Entegra Cornerstone 45B
Jeep Wrangler
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