Customer had two hose bibs with no water coming through them. Located the shutoffs and turned them on. The hose bib on the side of the house by the outdoor hvac unit was operating fine. The shutoff was holding and the hose bib was functioning properly. The hose bib on the side of the house by the kitchen was dripping and the shutoff wasn’t holding. Checked house pressure at 88 psi. This is higher than the recommended 80 psi max by code and is unsafe for the house. The thermal expansion tank had failed and the prv was replaced recently. Replaced and properly strapped the thermal expansion tank and replaced the hose bib and shutoff by the kitchen wall. Tested all work to ensure proper function and no leaks. None were found.