The remodeling contractor came over yesterday, looked around a lot, ended up cutting access through drywall to get to the back side of the tub/shower valve and plumbing (adjacent room, wall behind the tub/shower).
While the tub stopper /overflow plate does leak if you pour a lot of water on it, that didn't explain the leak, since that tub rarely gets used. So he kept looking. And with an inspection camera, found a leak in the hot side line in the remodel work - - so then cut access to the plumbing. (Cutting drywall easier to repair than ripping out the tiled wall in the bathroom).
The leak is at a pex fitting installed by the contractor, where it attaches to existing brass plumbing. Weirdly, our house has brass in a lot of the plumbing. The pex isn't leaking at the clamp (the clamp you use when installing), but in the fitting itself - - looks like a defective fitting.
He's coming back today to repair the plumbing, and we're letting everything dry out in wall. Then next week he'll come back and repair the drywall. I'm in northern Nevada, it's very dry here, and 80* temps every day now. Stuff will dry fast.
Pics are of the cut in the wall behind the tub/shower, and a close up of the fitting that leaked.


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