HEAT PREVENTATIVE MAINTENANCE ON FURNACE. REPLACED FILTERS ON UNITS. CLEANED FLAME SENSOR AND BURNERS IF NEEDED. INSPECT HEAT EXCHANGER, EVAPORATOR COIL AND BLOWER WHEEL. TIGHTEN UP ALL ELECTRICAL.MEASURED INDUCER MOTOR AMPS, BLOWER MOTOR AMPS AND CAPACITOR MF VALUE. TESTED SAFETIES AND HIGH LIMIT ON UNIT. SYSTEM SAFE TO OPERATE. INDUCER MOTOR DIDNT CLOSE CONTACT ON PRESSURE SWITCH. INDUCER MAY FAIL. SOONER OR LATER.