It's baaaack - when I moved into my house there was a smell that came and went in the upstairs bathrooms mostly --

and outside but rarely at the same time. It was much worse when the weather changed. After about a year and a constant march of plumbers many of which wanted to practically tear my house down for tons of dough. I decided it must be a vent problem. I ordered a charcoal vent filter and it worked fine from early spring until now. I guess I need a new charcoal. My question is - since the smell is inside do you think there is a crack in the vent pipe somewhere inside the wall? I checked the attic exposed portion and it looks intact. It is copper/solid but old the house built in the mid-60's
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