As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER LANDING, AS M/R RPM DECREASING THROUGH 300 RPM, UNUSUAL TAIL ROTOR VIBRATION FOLLOWED BY T/R CHIP LIGHT. T/R GEARBOX CHANGED. OIL DRAINED FROM GEARBOX CONTAINED MINUTE AMOUNT OF FERROUS AND A LOT OF NON-FERROUS METAL PARTICLES. DISASSEMBLY REVEALED CRACK IN COVER ADJACENT TO ROLLER BEARING OUTER RACE AND THROUGH OIL GALLERY.