As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, FLIGHT CREW HEARD A LOUD BANG FOLLOWED BY NR 1 ENGINE OVERTEMP. SHUT DOWN THE NR 1 ENGINE. FLIGHT CREW ELECTED TO RETURN TO DEPARTURE AIRPORT. LANDING WAS UNEVENTFUL. MAINTENANCE FOUND METAL IN THE TAILPIPE AND REMOVED AND REPLACED NBR 1 ENGINE.