As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT HAD AN AIR TURNBACK. UPON GEAR RETRACTION, NOSE GEAR MADE A LOUD NOISE AND CONTINUED TO SPIN. NO GEAR OR GEAR DOOR LIGHTS. GEAR ALSO VIBRATED. ONCE AT GATE MAINTENANCE FOUND THE LEFT NOSE GEAR DOOR OPEN. RESECURED NOSE GEAR DOOR.