Called out for water heater leak and found that pressure was at 110 psi and the expansion valve was bad gave estimate to replace both and to replace the vent, pipe going to the water heater that was not code and to replace the water heater. Customer agreed to replace all of the above. Removed old items and installed new prv, expansion tank, water heater, vent going from heater to ceiling and pipes coming off water heater. Tested and working properly at this time with no leaks.