We’re on site and customer stated that the water heater was leaking at the expansion tank. When we walked down to the basement, and the basement was flooded because of the expansion tank. I went ahead and checked house pressure and found that the house pressure was at 100 PSI which was an indicator that the PRV had failed which also caused the expansion tank to fail. I gave the customer multiple options on the solution and he decided to go with the expansion tank replacement and PRV replacement only. Once PRV was installed I went ahead and adjusted the house pressure down to 65 psi and replace the expansion tank setting the air pressure to 75 psi. I also turned back on the heater and ensured hot water.