Nobody wants to hear that walls have to be opened just to look around. A hidden leak is stressful enough, the climbing bill, the warm spot on the floor, the faint sound of running water in the quiet with everything off. What adds to the stress in La Jolla is picturing the search, someone opening walls on educated guesses through rooms nobody wants torn up. That kind of search is mostly outdated.
Modern detection is a big step forward. The equipment listens through slabs, reads temperature gradients through walls and traces lines under floors, and much of the time it can close in on a small section with little or no opening, as the leak and the construction allow. You hear the finding in plain English with every option on the table, including the options that never touch the finished surfaces. The licensed contractor sets the approach each time.
Occasionally the search finds nothing, and that's welcome news, a slab leak ruled out, nothing opened, and the bill left to check somewhere simpler. Either way, you end the day with the facts in hand and the decisions entirely yours, made at your own pace.