As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE NOSE GEAR DID NOT EXTEND WHEN GEAR HANDLE WAS SELECTED DOWN ON FINAL APPROACH. THE GEAR WAS CYCLED AND EXTENDED NORMALLY FOR A SAFE LANDING AT IAH. MAINTENANCE FOUND THE NLG LOCK ACTUATOR AT FAULT. THE NLG LOCK ACTUATOR WAS REMOVED AND REPLACED IAW MM 32-33-1. OPERATIONAL AND LEAK CHECKS WERE GOOD.