As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE WAS RETURNED TO THE REPAIR STATION FOR DAMAGE NOTED ON THE HPC ROTOR BLADES. THE ENGINE WAS BEING BORESCOPE INSPECTED NO OPERATIONAL ISSUES WERE NOTED. DISASSEMBLY REVEALED HPC ROTOR LIBERATED THE OUTER LEADING EDGE OF ONE CORNER OF ONE MAIN BLADE ABOUT THE SIZE OF A THUMB NAIL.