As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTURE FROM EDFH, NLG DID NOT RETRACT. FROM NGL INSPECTION WINDOW FOUND GROUND PIN STILL IN GEAR. RETURNED AIRCRAFT TO EDFH AND CREW LANDED WITHOUT INCIDENT. FOUND GROUND HANDLERS NOSE GEAR PIN INSTALLED. THE HANDLERS NOSE GEAR PIN WAS REMOVED, PER ANY APPLICABLE MANUALS AND AIRCRAFT WAS RETURNED TO SERVICE.