As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING THE COURSE OF A 100 HR INSP, AME FOUND A LARGE AMOUNT OF NON-FERROUS METAL PARTICLES IN THE REDUCTION GEARBOX OIL FILTER AND THE OIL DRAINED FROM THE GEARBOX. CHIP PLUG WAS INSPECTED AND FOUND CLEAN. REDUCTION GEARBOX WAS REMOVED AND REPLACED WITH A SERVICEABLE GEARBOX. LATER TEARDOWN OF THE GEARBOX FOUND THE INPUT BEARING LINER P/N 214-040-214-1 HAD SHEARED ITS 3 RETAINING PINS AND SPUN WITHIN THE MAGNESIUM CASE P/N 214-040-211-005.