What's on the other side of the wall? Could they get to the pipe from that side with a sheetrock repair?

Cabinets. The plumber is seeing if he possibly can. I told him I would pay a big bonus if he could figure that out!

Show the other side. You have no idea how long that was leaking.......and you have no idea how much mold could be behind the plumbing.

"Cabinets" .............? What cabinets? What room?

Anytime there is a leak in a wall the best fix is a redo so rip out all the tile fix the leak rewaterproof preperly and new tile . Big bonus those dated tiles need to be gone anyway. Too much risk of damage behind walls to try to repair only this bit and I can almost bet the niche is also leaking .

It will be cheaper to remove and reinstall cabinets than to start messing with the waterproofing in the shower unless you are signed up for a whole guy remodel.

Hahaha whole gut…

Thanks all. The collective feel like that we will go through the cabinet. It will mean deconstructing the shelves but agree this will be the best way to go. The drip was very small and appears to be confined to one area that we have been drying
Our house is going on the market in a few weeks. Definitely did now want a complete remodel

“Did not”

ouch! good luck!