Customer had a water heater that had flooded in crawlspace and the pilot went out. Customer was concerned that the rainwater had caused it to flood. Noted that it was unlikely since the height of the heater in the crawlspace was much higher then the low ground with the groundwater pumps. Found water leaking from subfloor above right next to the heater. Trace the leak back to a broken pipe under lavatory faucet. Found water in the cabinets, pooled on the floor, and running under the wall into the crawlspace. Replaced the chrome 1-1/4 trap and the threaded connection to the pop up assembly. Customer had questions regarding the pressure to the home. Water pressure is at 79 psi. Checked thermal expansion tank and it had failed. Replaced the thermal expansion tank. Inspected crawlspace to find prv location and prv is likely buried in the yard. This make prv replacement difficult since galvanized can’t be worked on and adding a second prv has a chance of causing flow issues. Replaced the the