What was found
FLT#1124, LAX-JFK. (ETOPS) ON DESCENT PASSING FL180 ENG 2 AIR SYS FAULT ECAM ANN AND QRH PROCEDURE COMPLETED -EVENTUALLY CLEARED; REF TSM 75-20-00-810-818-A #2 ENG BUFFER AIR CHECK VALVE WAS FOUND SEVERELY WORN REPLACED #2 ENG BUFFER AIR CHECK VALVE IAW AMM 75-26-03-400-801 REG LOGPAGE 428057, ITEM #2 (PERFORMED TSM 75-26-00-810-818-A UP TO STEP 4 SUBTASK A(9). NO DEFECTS NOTED IN ENG BEARING COOLING SYS. SENSE LINES INSPECTED W/ NO DEFECTS NOTED. PRIOR HISTORY SHOWS BUFFER AIR VALVE SOLENOID. BUFFER AIR VALVE AND PRESSURE SENSOR PRECAUTIONARY CHANGED. SUSPECT CHECK VALVE.) ALSO TEST #17 PERFORMED ABOVE 80% N1 NO FAULTS TEST OK.