AC repair in Tomball, TX.Performed refrigerant system leak search on 2.5 ton Amana 16 SEER system. Used several methods to be sure. Final evaluation is a small leak at the refrigerant system service valves. Replaced the valve cores and secured the system with tamper resistant caps. Checked refrigerant pressures and temperatures, temperature rise across the condenser, temperature drop across the evaporator and electrical parameters.