As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT 14TH STAGE DUCT WARNING MESSAGE ENROUTE AT FL210 OPERATED TO DESTINATION IAW QRH WARNING CHIMED ON AND OFF FOR DURATION OF FLIGHT WHILE LT ENGINE OPERATED AT IDLE. EMERGENCY DECLARED. R & R PYLON SENSING ELEMENT, A59WK, REF AMM 36-21-01.