As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON LEVEL OFF AT FL280, MOMENTARY ENGINE STALL ON #1 ENGINE. RECOVERED ON ITS OWN. ALL ENGINE READINGS NORMAL. ACCOMPANIED BY MOMENTARY ECAM MESSAGE. MAINTENANCE FOUND SCHEDULED MAINTENANCE REPORT FAULT FOR THE LPTC VALVE. MAINTENANCE REPLACED THE LPT ACTIVE CLEARANCE CONTROL VALVE PER AMM 75-22-10 AND ACCOMPLISHED A SATISFACTORY LEAK / OPERATIONAL CHECK.