As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AS PER AD CF-97-19, INSPECTION OF TAIL ROTOR DRIVE SHAFT THOMAS COUPLINGS CARRIED OUT. THE AFT OUTER DISC OF THE NR 7 DISC PACK WAS FOUND BROKEN IN TWO PLACES. DISC PACKS TAKEN FOR TESTING BY BELL. BHTC IS REDESIGNING DISCS TO OVERCOME MID-SPAN CRACKING.