Commercial plumbing repair. Open the ceiling in the men’s bathroom to locate the water leak. I removed wet pipe insulation and found a leak on the 2” main copper hot water line. Valve off the hot water heater and turn off the gas valve to the heater. Drain the system, cut out fittings that are leaking, and reinstall 2” copper propress fittings. Refill system and check for leaks, re-insulate piping system. Reinstall ceiling grid.