As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1446 -AT CRUISE, 5.2 VIBRATION INDICATION ON N2. BEGAN NEARING A THUMPING SOUND WHICH WAS MORE PRONOUNCED IN THE REAR OF THE AIRCRAFT AS CONFIMED BY THE FLIGHT ATTENDANTS. N2 WENT TO 9 AND THE ENGINE BEGAN TO SPOOL DOWN. CREW PERFORMED ENGINE SHUTDOWN PROCEDURES AND DECLARED EMERGENCY, DIVERTED TO OMA. REMOVED AND REPLACED NR 2 ENGINE PER PER JPC 2640071001. VENDOR IDENTIFIED FAILURE OF NR 4 BEARING AS THE ROOT CAUSE.