As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GNDED. ENG 1 STALLS AT FL370, ENG N1 DROPPED CONSIDERABLY. RECOVERED WITH NO FURTHER ABNORMAL INDICATIONS. FOUND DAMAGE 1ST, 3RD & 8TH STAGE HPC BLADES DURING A BORESCOPE INSPECTION. REPLACED THE ENG IAW TASK CARD 26L40071001 & ACCOMPLISHED A SATISFACTORY LEAK & OPERATIONAL CHECK.