2ND MAINTENANCE CHECK-UP PER SERVICE AGREEMENT FOR HEATING UNIT. CLEAN AND CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. CLEAN AND CHECK BURNERS AND BURNER OPERATION. CHECK THERMOSTAT, HIGH LIMIT CONTROL, FAN CONTROL, HEAT EXCHANGER, AIRFLOW, AIR FILTER, ENERGY CONSUMPTION, AND ALL ELECTRICAL CONNECTIONS. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS. EVERYTHING IS OPERATING GOOD.