As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4469 - CREW REPORTED AFTER TAKEOFF FROM YYZ, LEFT DUCT MESSAGE ILLUMINATED ON EICAS. CREW FOLLOWED QRH PROCEDURES AND SHUT DOWN LEFT ENGINE. AIRCRAFT LANDED SAFELY. MAINTENANCE REPLACED 14TH STAGE DUCT OVERHEAT/FIRE LOOP IN THE LEFT ENGINE PYLON. OPERATIONAL CHECKS WERE GOOD. AIRCRAFT RETURNED TO SERVICE. (X)