CLEAN AND CHECK HEATING UNIT. CHECK BURNERS AND BURNER OPERATION, HEAT EXCHANGER, HIGH LIMIT CONTROL, THERMOSTAT, AIR FILTER, AIRFLOW, HUMIDIFIER, FAN CONTROL, GAS PRESSURE, AND ALL ELECTRICAL CONNECTIONS. ADJUSTBLOWER COMPONENTS AND LUBRICATE ALL NECESSARY MOVING PARTS. INSTALLED PREM ADC. PURCHASED NEW SERVICE AGREEMENT, 2YRS.