MAINTENANCE TUNE-UP PER SERVICE AGREEMENT FOR 6 YEAR HT UNIT. DNS SERVICE AGREEMENT. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. CHECK ENERGY CONSUMPTION, HEAT EXCHANGER, HIGH LIMIT CONTROL, FAN CONTROL, THERMOSTAT, AIR FILTER, AIRFLOW, AND ALL ELECTRICAL CONNECTIONS. EVERYTHING IS RUNNING GOOD.