As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKE OFF WHILE REDUCING POWER TO CRUISE SPEED PILOT REPORTED LEFT ENGINE STOPPED REDUCING AT 2800-2900 RPM THE PILOT ELECTED TO RETURN TO THE FIELD. AFTER LANDING THE PILOT REPORTED THE LEFT PROPELLER GOVERNOR LINKAGE CAME OFF. MAINTENANCE INSPECTED AND FOUND THE PROP GOVERNOR LINKAGE WORN AND NUT MISSING. THE LINKAGE WAS REPLACED WITH NO FURTHER DEFECTS.