As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH, SELECTED LANDING GEAR DOWN AND RECEIVED A GEAR DISAGREE WARNING. COMPLIED WITH QRH AND PERFORMED MANUAL FREEFALL OF LANDING GEAR FOLLOWED BY THREE DOWN AND GREEN INDICATIONS. REMOVED AND REPLACED THE NOSE LANDING GEAR DOOR SELECTOR VALVE AND THE NLG GEAR SELECTOR VALVE IAW AMM. SWUNG GEAR. SYSTEM OPS CHECKED GOOD.