What was found
A/C WAS NORMAL OPERATION AFTER TAKE OFF. WHILE ALTITUDE 35000 FEET, THE PILOT TRIED TO CONTACT CONTROL CENTER BY HF RADIO. BUT AFTER DECREASE AIR SPEED TO 230 NM , RT ENG GOT SHUTDOWN. THE PILOT IAW QRH LOWER ALTITUDE TO 18000 FEET, FINISHED RT ENH START PROCEDURE. AFTER THAT, PILOT CHECK RT ENG INSTRUMENT SHOWED NORMAL. THE A/C LANDED SAFELY AT 14:13(LOCAL TIME). AFTER A/C LANDED, THE MAINTENANCE TECHNICIAN PERFORMED FUNCTION CHECK WAS NORMAL. NEXT DAY (JAN 06),6 TECHNICIANS FROM TAIPEI TO PALAU FOR BORESCOPE INSPECTION, AND MORE TEST AS FOLLOWS: PERFORMED BORESCOPE INSPECTION OK, IAW AMM 73-00-00 REPLACED FCU (FUEL CONTROL UNIT). CHECK ALL ENG CONCERNED WIRE AND CABLE OK. RUNNING ENG TEST OK.