What was found
DURING CLIMBOUT FROM LIT, CREW EXPERIENCED NR 1 ENGINE LOW OIL PRESSURE INDICATION WITH ASSOCIATED WARNING LIGHT. CREW PERFORMED NR 1 ENGINE SHUTDOWN CHECKLIST. AIRCRAFT RETURNED TO LIT AND MADE AN UNEVENTFUL LANDING. INSPECTED ENGINE. REPLACED NR 1 ENGINE OIL PUMP, ENGINE GEARBOX ASSEMBLY, AND PERFORMED ENGINE POWER ASSURANCE RUN PER BOEING M/M. OIL PUMP P/N: 734340. S/N OFF: AV2800. S/N ON: AV3829.