As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH, WHEN SELECTED GEAR DOWN GOR (GEAR DISAGREE AND NOSE DOOR) MASTER WARNING. NLG INDICATED UP AND LOCKED MLG DOWN. CYCLED GEAR WITH SAME INDICATIONS. PERFORMED QRH AND OBTAINED 3 GREEN. REMOVED AND REPLACED NLG SELECTOR VALVE AMM. OPS CHECK GOOD. LEAK CHECK GOOD. (K)