13 POINT MAINTENANCE TUNE-UP FOR 5 YR HT UNIT. FOUND GROWTH ON COIL AND CABINET. ADDED FREON. INSTALLED UV, EARNED SERVICE AGREEMENT. UV WAS INSTALLED CORRECTLY AND MADE SURE WORK AREA WAS CLEAN WHEN JOB WAS FINISHED. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. LUBRICATE ALL NECESSARY MOVING PARTS AND ADJUST BLOWER COMPONENTS. CHECK THERMOSTAT, HEAT EXCHANGER, HIGH LIMIT CONTROL, FAN CONTROL, AIRFLOW, AIR FILTER, ENERGY CONSUMPTION, AND ALL ELECTRICAL CONNECTIONS. EVERYTHING IS RUNNING GREAT.