What was found
(CAN) ENROUTE FROM VANCOUVER TO JAPAN, THE FLIGHT EXPERIENCED A POWER LOSS ON NR 3 ENGINE. ROLL BACK TO 77 PERCENT THEN AUTO RE LIGHT OCCURRED RAPIDLY. LATER ON INTO THE FLIGHT, THE FLIGHT CREW HAD THE ENGINE LOW PRESSURE MESSAGE AND ON APPROACH TO NARITA, THE CREW ELECTED TO SHUTDOWN THE ENGINE. NO EMERGENCY LANDING. ENGINE REPLACED.