As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
POSSIBLE LEFT ENGINE COMPRESSOR STALL AT FL390. AIRCRAFT ARRIVED WITHOUT INCIDENT AND HAS BEEN GROUNDED FOR INSPECTION AND MAINTENANCE. ACCOMPLISHED UNUSUAL CONDITIONAL INSPECTION IAW B767 AMM 72-00-00 NO FINDINGS NOTED. BORESCOPE IAW B767 AMM 72-00-00 NOTED STARTING AT STAGE 14 AND DOWN TO STAGE 10 FOUND MULTIPLE BLADES WITH DAMAGE OUT OF LIMITS. REMOVED AND REPLACED LEFT ENGINE. ALL OPERATIONAL AND POWERPLANT CHECKS GOOD.