As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT, CREW HEARD A VIBRATION SOUND COMING FROM THE NLG AREA. THEY CYCLED THE NLG AND THE NOISE CONTINUED. CREW RETURNED TO DEPARTURE WITHOUT FURTHER INCIDENT. MX INSPECTED AND FOUND RT NOSE GEAR DOOR WAS DOWN. MX LUBED DOOR LOCK MECHANISM. OPS CHECK GOOD IAW MM 32-22-2. ACFT WAS RETURNED TO SERVICE.