Customers T&P line had a steady drip. Checked pressure and pressure was at 150 psi. Recommended replacing regulator as the first step to see if this solves the issue. Explained to customer that this isn’t a guarantee to fix the issue. If issue still persists then we will re- evaluate as next course of action. Returned and replaced customer ball valve and regulator. Ran water for several minutes and no water was coming out of the T&P line. Issue appears to have been fixed. Customers galvanized where old and had severe build up inside. Highly recommended performing a repipe