As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT THERE WAS A LOUD NOISE IN COCKPIT DURING FLIGHT. THE CREW SUSPECTED THAT THE NLG DOORS WERE OPEN. THE ACFT WAS RETURNED TO FIELD & LANDED WITHOUT FURTHER INCIDENT. MX REPLACED THE NLG DOOR SOLENOID VLV. OPERATIONAL & LEAK CHECKS WERE GOOD WITH NO FURTHER DEFECTS NOTED.