As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AC WAS BEING TAXIED WHEN A SNAP WAS HEARD AND THE AIRCRAFT STARTED AN UNCOMMANDED TURN. THE PILOT IMMEDIATELY PULLED BOTH MIXTURES SHUTTING DOWN THE ENGINES. UPON EXITING THE AIRCRAFT, THE PILOT FOUND THE NLG LEANING AND TURNED SIDEWAYS. THE AIRCRAFT WAS INSPECTED BY A LOCAL MECH WHO FOUND THE NLG TRUNNION LUG HAD FAILED, ALLOWING THE NLG TO TWIST OUT OF ITS MOUNT. WILL SUBMIT A MORE COMPLETE REPORT WHEN ALL FACTS ARE FOUND.