As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED THAT THE NR 1 ENGINE EXPERIENCED COMPRESSOR STALLS, TWO OCCURANCES AT FL 390. SMOOTH AIR, AND ENGINE ANTI ICE OFF. BORESCOPE FOUND NUMEROUS STAGE 3 COMPRESSOR BLADES DAMAGED. REPLACED THE THE 1 ENGINE IAW TASK CARD 26L40071001. AIRCRAFT WAS GROUNDED.