As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING BORESCOPE INSPECTION OF ESN 16445, FOUND ONE 3RD STAGE LPT BLADE WITH SULFIDATION, APPARENT LOSS OF MATERIAL AND CORROSION GROWTH THROUGH THE BLADE. PER AMM 72-00-00-803-POO. THIS CONDITION REQUIRES THE ENGINE TO BE CHANGED. THE NR 1 ENGINE S/N 16445 HAS BEEN REPLACED REF 7100-9902E-01. TRANSFERRED DISCREPANCY TO ENGINE HISTORY.