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