As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FOUND PIECES OF BRAKE ON GROUND DURING WALKAROUND. ON DISASSEMBLY ROTOR DRIVE KEY BRACKETS FOUND SEPARATED. SEPARATOR IN TWO PIECES WITH TORQUE TUBE SPLINES MISSING. TORQUE TUBE FULL OF GREASE. SEAL CARRIER 'O' RING MISSING ALLOWING GREASE TO ENTER TORQUE TUBE. BRAKE REPLACED.