As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW PERFORMED AIR TURN BACK AFTER THE NR 1 ENGINE STALLED, ROLLED BACK, AND THEN DID NOT HAVE ANY THROTTLE RESPONSE. THE NR 1 ENGINE WAS SHUT DOWN BY FLIGHT CREW. MAINTENANCE FOUND TURBINE DAMAGE AND THE NR 1 ENGINE WAS REPLACED.