2ND 13 POINT MAINT. TUNE-UP PER SERVICE AGREEMENT FOR 2 HT UNITS, 5YR AND 6YRS. RENEWED 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 HEAT EXCHANGER, HIGH LIMIT CONTROL, FAN CONTROL, THERMOSTAT, AIRFLOW, AIR FILTER, ENERGY CONSUMPTION, AND ALL ELECTRICAL CONNECTIONS. EVERYTHING IS OPERATING GREAT.