As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THESE TWO BOLTS HOLD THE FUEL PUMP IDLER GEAR SHAFT TO THE ACCESSORY HOUSING. FAILURE OF THE BOLTS ALLOWED THE IDLER GEAR AND SHAFT TO DROP TO THE BOTTOM OF THE ACCESSORY CASE. THE FUEL PUMP STOPPED TURNING AND THE ENGINE QUIT. ENGINE RESTARTED, USING ELECTRIC PUMP AND AIRCRAFT RETURNED TO XXX. BOTH BOLTS WERE DISCOLORED AT FRACTURE SITE.