As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUSIE, HIGH VIBRATION ON NR 1 ENGINE WAS NOTICED. ENGINE WAS SHUTDOWN AT 0133. UPON INSPECTION FOUND C1 BLADES LOCKED UP. PERFORMED MTC MNL PROCEDURE 72-31-05 TO UNLOCK BLADES. ENGINE WAS RAN AND VIBRATION LIMITS WERE WITHIN ACCEPTABLE LIMITS.