As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMF - FLT 415 - AIR TURN BACK DUE TO NOSE LANDING GEAR UNSAFE LIGHT ILLUMINATED AFTER TAKEOFF. RECYCLED GEAR TWO TIMES AND LIGHT REMAINED ON. NOSE LANDING GEAR WOULD EXTEND IN THE OFF POSITION. LANDED WITHOUT INCIDENT. INSPECTED NOSE LANDING GEAR AND RELEASED AIRCRAFT FOR MAINTENANCE FERRY FLIGHT TO OAK. OAK MAINTENANCE REPLACED THE NLG LOCK ACTUATOR AND THE NLG DOWN LOCK SENSOR. GEAR OPERATED NORMALLY DURING ENTIRE GEAR CYCLE. REFERENCE ASAA9610021.