As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT WAS IN-FLIGHT WHEN ENGINE FAILED. PILOT PERFORMED EMERGENCY PROCEDURES AND RETURNED TO AIRPORT. INSPECTION REVEALED THE GOVERNOR DRIVE GEAR HAD FAILED. GOVERNOR DRIVE GEAR ALSO DRIVES THE ENGINE DRIVEN FUEL PUMP WHICH, WHEN GEAR FAILED, TOOK THE ENGINE DRIVEN FUEL PUMP OFF-LINE. GOVERNOR DRIVE GEAR APPEARS TO HAVE BEEN CRACKED BEORE FAILURE. (X)