As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GOT R 14TH DUCT WARNING MESSAGE ON TAKEOFF. CHECKED ANTI-ICE PAGE AND SAW RED LINE GOING UP THE RIGHT SIDE OF THE FUSELAGE. ANTI-ICE WAS OFF, NEVER USED. ABOUT 30 SECONDS LATER GOT BOTH L & R 10TH DUCT WARNING MESSAGES. FOLLOWED QRH, RETURNED TO FIELD WITH RIGHT ENGINE IDLED. (FLIGHT #5659) OPS CHECK OF THE ANTI ICE SYSTEM IS GOOD AT THIS TIME.