As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GLEASON GEAR CRACKED. PILOT REPORTED HAVING A CHIP LIGHT AND NOISE COMING FROM MAIN TRANSMISSION ASSY. BORESCOPE INSPECTION OF TRANSMISSION YIELDED A CRACKED GEAR. GEAR SENT TO AGUSTA S.P.A. FOR EVALUATION. TB109K-16 AND AD 97-26-09 ADDRESS THIS SITUATION ON A109K2 HELICOPTERS.