2ND MAINT. CHECK-UP UNDER SERVICE AGREEMENT FOR 2 HT UNITS, 9 YR, AND 10 YR. RENEWED SERVICE AGREEMENT. CHECK MANIFOLD GAS PRESSURE AND FOR PROPER VENTING. CLEAN AND CHECK BURNERS AND BURNER OPERATION. LUBRICATE ALL NECESSARY MOVING PARTS AND ADJUST BLOWER COMPONENTS. CHECK THERMOSTAT, AIR FILTER, AIRFLOW, HIGH LIMIT CONTROL, FAN CONTROL, HEAT EXCHANGER, ENERGY CONSUMPTION, AND ALL ELECTRICAL CONNECTIONS. EVERYTHING IS OPERATING GREAT.