What was found
HEAT TAT STATUS MSG. MOST LIKLY NEED TO PROBE 78-3421-3-0001. AVAIL SFO. PLF MSG 30-30170...LATCHED. PERFORMED CMCF 34 AIR DATA SYSTEM, SYSTEM TEST, LEFT AIR DATA HEATERS...FAILED. ADDITIONAL FAULT AFTER TEST...30-30180. REPLACED THE TOTAL AIR TEMPERATURE PROBE. FAULT MESSAGES ARE NON 00-0609-3-8694,QTY :1 ACTIVE AND LATCHED MESSAGE CLEARED. TOTAL AIR TEMP PROBE OPS CHECKED GOOD. REF AMM DMC-B787-A-34-12-03-00A-720A-A. PARTS USED: 78-3421-3-0005,QTY :1 78-3421-3-0001,QTY :1 ADD FAULT:30-30170 .