I am in a newly constructed home, approaching the end of our one year warranty period. The pipes in the walls in our kitchen and master bath make noises for a moment, then stop, when the hot water is turned on. Sometimes they make noise as they ‘cool’ back down. The plumbers say they must tear out walls to fix the problem. My worry is, given the noises are so brief, how can they tell where to start ripping the wall out? Is there a better way?