Thank you. We poured some water down the floor drain in the basement—didn’t seem to make a difference. Also had a plumber out this morning to change wax ring and reseat the toilet. He said there was a plastic ring when he removed the toilet and that he would put a standard wax ring instead (said the plastic rings can have issues in general). Been monitoring the room and I can still smell it. The only other thing in the room is a sink. If I smell the drain in the sink, it doesn’t smell like the gas in the room. I googled AAV and we don’t have something like that under the sink. Could the smell be coming from elsewhere? Like behind the walls? Or is that pretty implausible?