As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED NOSE GEAR RETRACTED AND A THUMPING NOISE WAS NOTED, UPON WHICH THE NOSE GEAR EXTENDED AND LOCKED. MAIN GEAR WERE EXTENDED AND PRECAUTIONARY LANDING MADE. INSPECTION BY MECHANIC PERSONNEL FOUND NOSE GEAR ACTUATOR ROD END HAD SHEARED AT THE END OF THE THREADS ON THE BEARING END. NO OTHER DAMAGE NOTED.