As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROX. 3 HRS. INTO CRUISE NR 3 ENGINE FIRE DETECTION WENT TO 700-800 WITH FIRE INDICATION. TEMP INDICATION ALLOWED THRUST LEVER AND WENT TO 630EGT WITH FIRE INDICATION GOING OUT. FOUND RT FWD HPT RECOUP AIR DUCT RUPTURED, REMOVE AND REPLACED AS PER AMM 72-09-03. ACCOMPLISHED INSPECTION AS PER AMM 05-51-28 NO FUTHIER FINDINGS.