As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. FLIGHT CREW REPORTS ENGINE #1 COMPRESSOR STALL ECAM MESSAGE IN CRUISE FLIGHT AT FL360 UPON POWER REDUCTION. ALL INDICATIONS NORMAL AFTER POWER LEVER MOVED TO IDLE. RESUMED NORMAL OPERATIONS. TROUBLESHOT ECAM MESSAGE PER TSM 73-00-00-810-865-A FAULT ISOLATION STEP 4B &4.C.2. PRESSURE REGULATING VALVE 4001HA1 LEAKING FROM THE OPENING/CLOSING CHAMBER 5. REMOVED AND REPLACED VALVE IAW AMM 36-11-52. ACCOMPLISHED HIGH POWER ENGINE RUN. SYSTEM CHECKS GOOD.