As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING A BORESCOPE INSPECTION AND ROTATING THE ENGINE, A NOISE WAS HEARD AND THE N1 SECTION OF THE ENGINE LOCKED UP. REMOVED THE ENGINE AND DISASSEMBLED MODULE 1 FROM MODULE 2 AND AWAITED MFG SUPPORT TO COME AND DISASSEMBLE MODULE 2. UPON DISASSEMBLY OF MODULE 2 FOUND THE HP TURBINE DISC HAD 3 BLADES SHIFT AND WERE RUBBING INTO THE HP NOZZLE GUIDE VANE. MFG SUPPORT IS GOING TO REPLACE THE HP TURBINE WHEEL AND NOZZLE GUIDE VANE.