He backed out of the crawlspace, brushed dust off his knees, and pulled Carla aside. “Who did the renovation on 3C six months ago?”

Leo Diaz tightened the strap on his hard hat. In the city’s permitting system, a “P2” wasn’t just a routine check. It was a deep-dive investigation triggered by a complaint, a failure, or a tip. Someone inside Mercy had whispered to the code office about water hammer , odd odors , and pressure anomalies on the third floor of the old wing.

“I need to see the ceiling crawlspace above 3C,” Leo said.

Getting there required a ladder, a keycard, and squeezing past ductwork wrapped in old asbestos-label tape (still intact, thank God). Leo clicked on his inspection light. The space smelled of bleach, stale air, and something else: ozone . That meant arcing electricity or a pinhole leak spraying onto a motor.

Leo’s stomach dropped. He took out his phone and photographed the violation: wrong material, no certification, improper bonding, and—he wiped his gloved finger across the iron— rust freckling . That rust would flake off, travel downstream, and destroy a dialysis patient’s blood if the filters missed it. The hospital didn’t even know.