As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AT FL 360 IN CLEAR AIR HAD ENGINE 1 STALL. PERFORMED ECAM & QRH PROCEDURES. ENGINE 1 PERFORMANCE RETURNED TO NORMAL. MAINTENANCE FOUND THE SEALING SURFACE ON THE #1 ENGINE INLET PRESSURE CHECK VALVE DAMAGED AND REPLACED IT PER AMM 36-11-41. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO STALL INDICATION PRESENT DURING HIGH POWER RUN.