As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE HAD A COMPRESSOR STALL AT FL 390. AIR TEMP MINUS 25 DEGREES. ENGINE ANTI-ICE ON. DESCENDED TO FL 310 AND ALL OPERATIONS NORMAL. NO LIMITS WERE EXCEEDED. ENGINE WAS BORESCOPED AND CHECKED PER MM 71-00-35. NO FAULTS WERE FOUND AND THE AIRCRAFT WAS RETURNED TO SERVICE. NO ENGINE PROBLEMS WITH STALLING HAVE BEEN NOTED.