As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, THE NR 1 ENGINE EXPERIENCED A VIBRATION WHICH CONTINUED DOWN TO IDLE AND THE ENGINE WAS SHUTDOWN. DUMPED 60,000 LBS OF FUEL AND THE AIRCRAFT RETURNED TO ANC WHERE AN UNEVENTFUL THREE ENGINE LANDING WAS MADE. INSPECTION FOUND A PORTION OF THE FAN EXIT LINER HAD DETACHED AND WAS AGAINST THE EXIT GUIDES. THE ACOUSTICAL PANEL WAS REPLACED AND GROUND RUNUP CONFIRMED PROPER ENGINE OPERATION.