As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FAULT: AFTER TAKEOFF, LEFT ENGINE DUCT LEAK TEMPERATURE CONTINUED TO CLIMB IN ALL CABIN. RETURNED TO CANCUN. FOUND DUCT ASSY 213T2109-5 RUPTURED. DUCT ASSY CHANGED, OPERATION CHECK CARRIED OUT, FOUND OK CONS SERVICEABLE AS PER AMM 36-11-01.