As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING N1 ROTATION, A GRINDING NOISE WAS HEARD FROM THE FRONT OF THE ENGINE. DISASSEMBLY REVEALED A 3RD STAGE IP ROTOR BLADE WAS MISSING. THERE WAS NO EVIDENCE OF UPSTREAM FOREIGN OBJECT DAMAGE. THE ROTOR HAS BEEN FLUORESCENT PENETRANT INSPECTED WITH NO OTHER NON-SECONDARY INDICATIONS NOTED.