Yeah, I believe I’ve removed the leak… see the plastic bag to the left? That’s where a toilet used to be. I’m fairly certain the toilet was leaking… for months… (and I’m an idiot who didn’t associate the smell with mold). The leak made it into the adjacent closet.

Phase one: Remove drywall, carpet, tile. Remediate the mold.

Phase two: Install a new toilet (I didn’t install the previous one.)

The old toilet had a blackened… hardened wax ring. Anyway, that’s a whole different project. Focusing on the mold for now.