As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER FURTHER ASSESSMENT, WE IDENTIFIED THE PROBLEM THAT CAUSED THE AIRCRAFT'S NLG ASSEMBLY NOT TO EXTEND. WE FOUND THAT THE NOSE GEAR DRAG BRACE CTR LOCK ARM SPLINE HAD CRACKED, WHICH DID NOT ALLOW THE SYS TO UNLOCK NORMALLY OR MANUALLY FOR THE NOSE GEAR TO COME DOWN.