What was found
FLT#187, LAS-BOS. (ETOPS) (AIRCRAFT DIVERTED TO LAX) 'ON DESCENT APPROACH AND LANDING AIR BLEED ABNORMAL AND AIR ENG 1 HP VALVE FAULT (HIGH-PRESSURE VALVES (HPV) ); PERFORMED ENG RUN ON #1 ENGINE, PERFORMED LEAK AND OPS CHECK OF HP VALVE IAW AMM 71-00-00. GROUND VERIFICATION COMPLETED, REF LP 3509913, ITEM 2 (ACCOMPLISHED LEAK CHECK OF #1 ENG HYD SUCTION LINE IAW AMM 29-11-39. NO LEAK NOTED) FOR MX ACCOMPLISHED. THIS CLEARS MDDR 497620. THE PLACARD WAS REMOVED, AND MX-4 WAS UPDATED. MCC BOB CONTACTED. OPS CHECK SATISFACTORY.' (SUPPLEMENTAL INFORMATION ADDED TO ENGINE INFORMATION)