As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SPLINE PORTION OF PIVOT ASSY SHEARED DURING NORMAL OPERATIONAL USE. RIGHT MAIN GEAR LEG WOULD NOT LOCK DOWN. PILOT DID A GREAT JOB OF MINIMIZING DAMAGE TO A/C. RECOMMEND FLUORESCENT PENETRANT INSPECT DURING ANNUAL INSPECTION OF SPLINE SHAFT WHERE IT MEETS THE REST OF THE PIVOT ASSY.