As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING GEAR RETRACTION AFTER TAKEOFF, A LOUD NOISE WAS HEARD FROM THE NOSE GEAR AREA. THE LANDING GEAR RETRACTED AND THE LIGHTS WENT OUT. RECYCLED GEAR AND CONDITION REMAINED. FOUND LEFT NOSE LANDING GEAR DOOR UNLATCHED. CLEANED AND LUBED THE ACTUATOR MECHANICAL RELEASE AND PISTON. VERIFIED DOOR LOCKING OPERATION.