Looking for recommendations on a thorough, investigative, and possibly creative plumber. The plastic tube that feeds our fridge's ice maker and water dispenser doesn't have a shut-off valve that we can find... nor can we find its origin. It just... disappears into the wall and we can't find its source. We've checked every conceivable place we can think of. No luck.
Now that we're replacing our fridge, we need to get to the bottom of this mystery, and we need to have a shutoff properly installed. I mean, I think that's what we need. I'd defer to a trusted plumber on other approaches.