As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3331 - ATB - PERFORMED AN AIR TURN BACK DUE TO LEFT ENGINE EXPERIENCING MULTIPLE COMPRESSOR STALLS ON CLIMB OUT. CORRECTIVE ACTION: DURING BORESCOPE INSPECTION FOUND SIGNIFICANT 5TH AND 6TH STAGE HPC DAMAGE. REPLACED ENGINE PER AMDS WORK CARD 7100-9904-01. OK FOR SERVICE. DELTA LOG PAGE 6863904.