As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT, NR 3 ENGINE FIRE INDICATION. INDICATION STOPPED WHEN ENGINE WAS SHUT DOWN. ENGINE EGT WENT TO 953C MOMENTARILY. *S/D* THE 16TH STAGE PNEUMATIC SUPPLY DUCT FAILED AND RUPTURED AT ONE OF THE ATTACHMENT LUGS. ABNORMAL VIBRATION CONDITION WAS CONFIRMED IN TEST CELL RUN.