As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ON THE VISUAL APPROACH INTO RWY 13 IN BIS ABOUT SEVEN MILES OUT THE NOSE GEAR FAILED TO EXTEND PROPERLY AND WE RECEIVED THE ASSOCIATED "GEAR DISAGREE" WARNINGS. WE ABORTED THE APPROACH AND REQUESTED AN EXTENDED DOWNWIND LEG, WHILE GOING THROUGH THE QRH. REMOVED AND REPLACED NLG SELECTOR VALVE IAW AMM AND OPS CHECK OF EXT/ RET.