Well... went into the guest bathroom to put away a couple of towels... stepped between the commode and the tub... felt the floor give... :mad:
Nothing on the surface so water must've been seeping from the wax ring under the linoleum.
Christmas project defined. Crap
Glad I found it at least. I don't go in there often. No indication on the downstairs ceiling. Feels like minim of new subfloor and then linoleum or tile. Probably pull everything except the tub