2ND TUNE-UP UNDER SERVICE AGREEMENT FOR 3YR HEATING UNIT. THERE ARE 2 UNITS. RENEWED SERVICE AGREEMENT ON BOTH UNITS. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK HEAT EXCHANGER AND HIGH LIMIT CONTROL. CHECK MANIFOLD GAS PRESSURE AD FOR PROPER VENTING. LUBRICATE ALL NECESSARY MOVING PARTS AND ADJUST BLOWER COMPONENTS. CHECK THERMOSTAT, AIR FILTER, HUMIDIFIER, AIRFLOW, ENERGY CONSUMPTION, AND ALL ELECTRICAL CONNECTIONS.