Thanks all for the suggestions.
I'm due to get on the roof to clean it in the next couple of days so I will examine the vents then.
Interestingly, the August issue of "Motorhome" hit my mailbox yesterday and the Letters section is all about sewer odors.
I'll report back soon.
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James G.
2017 Thor Chateau 23U
Ford E450
Charlotte, NC
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