1 system A/C preventative maintenance check completed. Changed the filter which the customer provided. Cleared the drain line. Tested the mechanical and electrical components. All are in good shape. Recommended adding a hard start kit to reduce the load on the compressor and to prolong the life of the system. Recommended adding surge protection to protect the unit from power surges. Chemically washed the condenser coil. The system is cooling at this time. The customer used a $50 gift card.