As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON LIFTOFF, FLIGHT CREW SELECTED GEAR UP. THE NLG WOULD NOT RETRACT AND THE NOSE GEAR DOORS WOULD NOT OPEN WITH THE "RETRACT COMMAND". THE MAIN GEAR DID RETRACT. FLIGHT CREW DECLARED AN EMERGENCY WITH ATC AND RETURNED TO DEPARTURE AIRPORT WITH ALL LANDING GEAR INDICATING DOWN AND LOCKED. AFTER LANDING, MX WAS UNABLE TO OPEN NLG DOOR WITH ELECTRICAL SELECTION VIA GROUND SERVICING SWITCH. DOOR SELECTOR VALVE WAS CHECKED FOR ELECTRICAL CONTINUITY AND AN "OPEN" WAS DISCOVERED IN THE VALVE'S WINDINGS. REPLACED VALVE AND RETURNED ACFT TO SERVICE.