What was found
ENGINE REMOVED FROM ACFT AND SENT FOR EVALUATION. THIS LAST MAJOR ENGINE MAINTENANCE THAT WAS ACCOMPLISHED WAS A MAJOR PERIODIC INSPECTION PERFORMED ON 1/6/2008. TOTAL ENGINE TIME AT THAT TIME WAS 6408.3 HOURS AND THE ENGINE HAS OPERATED A TOTAL OF 1222.4 HOURS SINCE THEN. PRIOR TO THAT A CORE ZONE INSPECTION PERFORMED ON 6/26/1997. TOTAL ENGINE TIME AT THAT TIME WAS 3684.5 HOURS AND THE ENGINE HAS OPERATED A TOTAL OF 3946.2 HOURS SINCE THEN. THERE ARE NO LOG BOOK ENTRIES REPORTING ANY OPERATING PROBLEMS WITH THE ENGINE SINCE THOSE MAINTENANCE EVENTS. BASED ON THE DISASSEMBLY OBSERVATIONS IT IS APPARENT THAT THE FAILURE OF THE NR 4 BEARING LEAD TO THE IN-FLIGHT SHUTDOWN.