As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EK9971 ICN/ANC (ATB) FIRE WARNING: NR 4 ENGINE FIRE LIGHT CAME ON IN-FLIGHT NACELLE INDICATOR WAS ABOUT 3 TO 3.5 EGT APPROX 900 DEGREE HIGH STAGE BLEED LIGHT CAME ON JUST BEFORE FIRE LIGHT AND BELL. FIRE LIGHT CAME ON ABOUT FL 24.2 ENGINE S/D A/WITH FHB. INSPECTION FOUND NR 4 ENGINE PRECOOLER HAS CIRCUMFERENTIAL CRACK ON INLET FLANGE APPROX FROM 5 OCLOCK TO 10 OCLOCK. REPLACED PRECOOLER ASSY. LEAK CHECK NORMAL IAW MM 36-12-01.