As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) STARTER GEAR RETAINING RING (P/N 6401740) DISENGAGED FROM THE STARTER SHAFT AND LODGED IN THE STARTER GEAR NEEDLE BEARING (P/N 639788). THE NEEDLE BEARING FAILED WITH THE BEARING NEEDLES ENTERING THE ENGINE REAR CASE AND OIL SYSTEM. THE NEEDLES IN THE OIL SYSTEM DAMAGED THE FOLLOWING PARTS: OIL PUMP GEARS (2) P/N'S 3562 AND 21343 REAR CASE(1) P/N 640174STARTER DRIVE AND CLUTCH (1) P/N 641500.