As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN GEARBOX CHIP LIGHT CAME ON IN-FLIGHT. AIRCRAFT WAS SHUT DOWN AND FERROUS METAL FLAKES FOUND ON CHIP PLUG. UPON DISASSEMBLY OF GEARBOX, INPUT GEAR WAS FOUND CRACKED. THE CRACK WAS AT THE BASE OF TOOTH FOR THE ENTIRE LENGTH OF TOOTH AND INTO BEARING AREA. INSPECTION OF GEAR SHOWED AN INCLUSION IN THE METAL WHERE THE CRACK ORIGINATED.