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 FOR TAP BLUE ENROLLMENT AND NO OPERATIONAL ISSUES WERE NOTED. DISASSEMBLY REVEALED HPC ROTOR, PN 60442, SN LC2613 LIBERATED THE OUTER L/E OF ONE CORNER OR 1 MAIN BLADE ABOUT THE SIZE OF A THUMB NAIL. THE ROTOR IS ORIGINAL TO THE ENGINE.