What was found
DURING CLIMB, THROUGH FLIGHT LEVEL 270, THE CREW RECEIVED A LEFT WING ANTI-ICE MESSAGE AND COMPLIED WITH THE QUICK REFERENCE HAND BOOK AND LEVELED OFF AT LIGHT LEVEL 290.. THE MESSAGE EXTINGUISHED AND THEN RETURNED A FEW MINUTES LATER AS A RED 14TH DUCT MESSAGE THAT WOULD NOT EXTINGUISH. THE CREW DECLARED AN EMERGENCY AND DIVERTED. THE AIRCRAFT WAS LATER FERRIED AND THE LEFT PYLON DUCT WAS REPLACED.