As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT 14TH DUCT WARNING ILLUMINATED AFTER TAKEOFF. FOLLOWED QRH RETURNED TO AIRPORT FOR LANDING. RAN THE LEFT ENGINE AND FOUND THE LEFT 14TH STAGE PYLON SECTION BLEED AIR TUBE FORWARD CHECK BAND COUPLING LOOSE. TIGHTENED CLAMP RAN ENGINE IAW MM 21-00-00. BLEED AIR TUBE LEAK CHECKS GOOD IAW MM 30-20-01. RAN ENGINE FOR 30MINS WITH NO 14TH DUCT WARNING MESSAGE NOTED.