CLEAN AND CHECK 17YR OLD HEATING UNIT. CHECK HUMIDIFIER, CHECK THERMOSTAT, AIR FILTER, HIGH LIMIT CONTROL, HEAT EXCHANGER, FAN CONTROL, GAS PRESSURE, AND ALL ELECTRICAL CONNECTIONS. CLEAN AND CHECK BURNERS AND BURNER OPERATION. LUBRICATE ALL NECESSARY MOVING PARTS, AND ADJUST BLOWER COMPONENTS. NEW SERVICE AGREEMENT.