What was found
ON APPROACH TO FINAL RKSI RECEIVED LEVEL 1 HYD QTY LO. CARRIED OUT MISSED APPROACH TO RUN QRH. ON VECTORS FOR SECOND APPROACH RECEIVED HYD 2 OFF. ALSO RECEIVED ENG 2 FADEC FAULT (SEPARATE WRI WRITE UP). RAN QRH. DECLARED EMERGENCY WITH RKSI TOWER AND EMERGENCY EQUIPMENT LOOKED US OVER AFTER LANDING. THEN TAXIED TO PARKING. ***EMERGENCY DECLARED*** REMOVED & REPLACED INBD FLAPS LOCK VALVE (MPN : AYG7323-5509 S/N : DAC1732), BLED THE FLAP LOCK V/V AND PERFORMED FLAP OPERATION/RANGE OF MOVEMENT TEST, THEN ALL TEST PASSED AND NO LEAKAGE NOTED PER AMM 27-52-11-4. A/C OK FOR SERVICE.