As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CRACK DISCOVERED IN TAIL ROTOR GEARBOX ATTACH CASTING PN 105-30402-100.12 PROGRESSING FROM UPPER LEFT CORNER THROUGH FIRST LOWER WEB (ABOVE UPPER LEFT BOLT HOLE) AND ENDING JUST PRIOR TO THE MAIN CENTER WEB. DISCREPANCY DISCOVERED AT THE 100 HOUR INSPECTION. PROBABLE CAUSE: VIBRATION DUE TO WORN FEATHER BEARINGS.