Ooohhh... that stinketh, Angel
The net result of yesterday's plumbing activity was that some time ago, I put a nail in the wall... right into a return plumbing pipe. It's been leaking ever since, and finding this spot required cutting holes in the wall.
Fortunately, it's in the mudroom, which we're planning to redesign. And when we do, that wall will be gone.
However, now that the hole in the pipe is patched I've got three holes in the wall to patch and paint over... temporarily, of course.
Could have been worse, though... could have been John the Wonder Plumber.