As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE CARRYING OUT THE ALF INSPECTION, THE ENGINEER NOTICED THAT A PORTION OF A TURBINE BLADE WAS MISSING. A THOROUGH INSPECTION WAS CARRIED OUT UPSTREAM OF THE MO4 UTILIZING A BORESCOPE, NO ANOMALIES WHERE NOTED. ANOTHER S/N MO4 WAS INSTALLED WITH NO FURTHER INDICATION OF PROBLEMS.