2ND CLEAN AND CHECK UNDER SERVICE AGREEMENT FOR HEATING UNIT. CHECK ALL ELECTRICAL CONNECTIONS, HEAT EXCHANGER, HIGH LIMIT CONTROL, THERMOSTAT, AIR FILTER, HUMIDIFIER, FAN CONTROL, AND PROPER ENERGY CONSUMPTION. CLEAN AND CHECK BURNERS AND BURNER OPERATION, AND GAS PRESSURE. ADJUST BLOWER CONSUMPTION, AND LUBRICATE ALL NECESSARY MOVING PARTS. RENEWED SERVICE AGREEMENT.