As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHEN TORQUE CHECK OF ENGINE MOUNT BOLTS PERFORMED OB BOLT CORRECT TORQUE COULD NOT BE ACHIEVED. BARREL NUT REMOVED AND FOUND TO HAVE DAMAGED THREADS AND WAS OF FIBER LOCK STYLE. BARRREL NUT AND BOLT REPLACED WITH IPC REQUIRED PARTS.