Called out for leak coming from water heater. Upon arrival, found thermal expansion valve constantly running. Found pressure in house to high at 105 psi. Turned off water at meter and cut out old prv. Installed new watts prv with new ball valve. Restored water and checked for leaks no leaks were found. Also replaced bad expansion valve with new thermal expansion tank with new hanging bracket. Tested for leaks. No leaks were found. Cleaned work areas.