As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, CREW REPORTED NOSE GEAR DID NOT RETRACT. RETURNED TO FIELD AND LANDED WITHOUT FURTHER INCIDENT. MX TROUBLESHOT NLG AND FOUND NLG MODULAR PACKAGE AND UP-LINE ACTUATOR CHECK VALVE DEFECTIVE. R & R NLG MODULAR PACKAGE AND UP-LINE ACTUATOR CHECK VALVE. PERFORMED NLG RETRACTION WITH NO FAULTS NOTED IAW AMM 32-33-31 AND AMM 32-33-00. TEST FLIGHT SATISFACTORY.