Aster bathroom right side faucet leaking out of handle and dripping out of spout. Replaced hot and cold cartridges and seats and springs. Flush tankless water heater. Rebuilt toilet in upstairs back bathroom. No further issue at this time. Customer had possible leak occurring under hall bathroom. Already had drywall opened. A water from every single fixture at the same time in the bathroom, no sign of leak anywhere. Approx location of leak lines up with cast iron wet vent going through roof. Signs of water marks on wood around the vent stack. Recommended checking it during a storm. No further issue at this time.