As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A LOUD BANG WAS HEARD UPON GEAR RETRACTION AND THE NOSE GEAR UNSAFE LIGHT REMAINED ON AFTER TAKEOFF FROM IAH. THE AIRCRAFT WAS RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND NOSE GEAR DOOR CABLE BROKEN WITH DAMAGE TO FWD NLG DOOR AND DOOR LOCK MECHANISM. THE CABLE, LOCK MECHANISM, AND DOOR WERE REMOVED AND REPLACED IAW MM 32-22-1.