As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ESN 893899 WAS REMOVED FOR A PROACTIVE O/H. DURING THE FLOURESCENT PENETRANT INSPECTION OF THE HIGH PRESSURE TURBINE ROTOR BLADES, IT WAS DISCOVERED THAT QTY 3 BLADES HAD TRANSITION ZONE FORWARD COOLING CIRCUIT CRACKING. AN ADDITIONAL 5 BLADES EXHIBITED CRACKING AT THE MINIMUM NECK POINT ON THE FIRTREE AT THE CONVEX LOWER POINT.