u/Ski-Maineiac

I’m a renter trying to better understand a possible plumbing issue in my apartment, which is a little under three years old. We’ve had intermittent sewer/rotten-egg odors, and the odor seems strongest under the bathroom sink.

After we started noticing the odor, the landlord had a plumber extend the roof venting because there was some thought that the HVAC might be drying out the traps. They performed a smoke test, which they reported was negative, but we weren't home when it happened. Since then, maintenance has come to my unit a few times, but I have not had a plumber inspect the AAV or the under-sink area directly. A couple of other units are apparently having similar odor issues, though theirs seem to be at the kitchen sink rather than the bathroom.

I was able to look into the wall/cavity near this bathroom sink and saw an air admittance valve. There appears to be insulation very close to the AAV. Could this setup contribute to intermittent sewer odor?

Apologies for the quality--it is TIGHT in there -- will follow up with pics as replies as I can't put both images and video in.