As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING NOSE GEAR COLLAPSED, MAINTENANCE INSPECTED AIRCRAFT AND FOUND AN AN4-22 BOLT MISSING FOR THE DRAG LINK AND BRACE ASSEMBLY/DOWN AND LOCK. FOUND HALF OF THE BOLT ON THE RUNWAY WITH THE CASTLE NUT AND COTTER PIN INTACT AND WAS NOT ABLE TO FIND THE HEAD OF THE BOLT.