As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAS - CREW REPORTED BUFFETING AND VIBRATION COMING FROM NOSE GEAR AREA. EMERGENCY DECLARED RETURNED LAS LANDED WITHOUT INCIDENT. UPON ARRIVAL AT GATE MAINTENANCE FOUND RIGHT FORWARD NOSE GEAR DOOR DOWN AND OPEN. REPLACED RIGHT NOSE GEAR DOOR LINKAGE ACTUATOR AND PERFORMED GEAR SWING. SYSTEM GROUND CHECKED NORMAL OPERATION.