Did a quick visual inspection of the downstairs plumbing found sink and shower both have pee traps both are holding water and don’t see any signs of a smell at this time but did see a one piece toilet that has no access except from the rear of the toilet cannot confirm or deny if the toilet is secured to the floor with T bolts Can only see silicone around the edge would recommend a replacement due to style of toilet and lack of space for pulling and resets. With any replacement of this toilet waterlines may need to be moved, but will be dependent on the type of toilet that is installed.