I would also inquire them to check then line vent. If that is clogged it could cause the odor. I'd personally evaluate my ground drains, and ensure they've got water in them. The water retains the odors out, and might evaporate. Your Plumbing Pal Be sure you cover the vacuum https://lukas4xhpx.idblogz.com/32645181/the-2-minute-rule-for-house-drain-cleaning