I would also request them to examine then line vent. If that is clogged it could result in the odor. I'd personally check out my flooring drains, and make sure they have h2o in them. The h2o keeps the odors out, and may evaporate. Your Plumbing Good friend A drainage https://bookmarksfocus.com/story4240898/5-essential-elements-for-house-drain-cleaning