Auditor Sharing Group Concerning AI

We keep running into problems that are clearly connected, low pressure upstairs, a slow drain downstairs and a damp spot near the wall that nobody can explain. I am trying to figure out what separates a company that handles rerouting and hidden leak detection from one that only does simple repairs. Do you ask for the diagnostic method upfront, or wait until someone inspects the system? While comparing local options I found a page from Baverbrothers that lists pipe replacement, multi fixture failures and pressure balancing as separate categories, which at least made the scope easier to understand. For now I am collecting a few quotes and paying attention to how clearly each one explains the diagnostics before any work starts.