As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAILURE OF INPUT PINION TAPERED ROLLER BEARING OF TAIL ROTOR GEARBOX. FAILURE OCCURRED DURING GROUND RUN AFTER MX. REPLACEMENT OF TAIL ROTOR GEARBOX. TAIL ROTOR GEARBOX INPUT CASING DISCOLORED DUE TO OVERHEATING OF FAILED BEARING. INPUT PINION SEIZED.