Upon arrival, the customer reported that the master bathroom faucet was continually dripping. I performed a water pressure test and found the home pressure to be 100 psi, which is significantly above the recommended range. Excessive pressure is the primary cause of the faucet dripping, it can lead to long-term fixture damage if not corrected. I inspected the expansion tank, and at this time replacement does not need it as it is functioning properly to resolve the pressure issue and protect the homes plumbing system. I replaced the three-quarter pressure reducing valve PRV in the basement to bring the water pressure back down to the safe and manufacturer recommended level. Once corrected, the fixtures in the home, including the master bathroom faucet will operate properly with less stress on the plumbing system. Homes water pressure is now at 70 psi .