As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF THE L 14TH DUCT WARNING MESSAGE ILLUMINATED. THE CREW FOLLOWED THE QRH, RETURNED TO PIT, AND MADE AN UNEVENTFUL OVERWEIGHT LANDING. MAINTENANCE TROUBLESHOT THE SYSTEM AND FOUND NO DISCREPANCIES. THE LT BLEED AIR LEAK CONTROL UNIT WAS REMOVED AND REPLACED IAW CRJ200 AMM 36-21-10-000(400)-801. THE SYSTEM OPERATIONALLY CHECKED GOOD. AN OVERWEIGHT LANDING INSPECTION WAS PERFORMED IAW CRJ200 AMM 05-51-01-210-801. NO DISCREPANCIES WERE FOUND. THE AIRCRAFT WAS THEN RELEASED FOR SERVICE.