Sorry Dan, I thought you were talking possibly of a slab leak.

A thermal imaging camera would be a great tool in the situation you describe.

A reputable stucco contractor is probably their first step. They already know they have a leak problem, no point in evaluating it any more. Call the person who can do the repairs.

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Rick Hurst_Home Works Inspection Co_Rockwall TX
In the words of Mike Tyson.... "Everyone has a plan until they get hit inda mouf"