2ND MAINT. TUNE-UP ON A 6YR HEATING UNIT. CHECK THERMOSTAT, ENERGY CONSUMPTION, AIR FILTER, HUMIDIFIER, HIGH LIMIT CONTROL, FAN CONTROL, GAS PRESSURE, AND ALL ELECTRICAL CONNECTIONS. CLEAN AND CHECK BURNERS AND BURNER OPERATION. ADJUST BLOWER COMPONENTS, AND LUBRICATE ALL NECESSARY MOVING PARTS. RENEWED SERVICE AGREEMENT.