As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED "GEAR DISAGREE" WARNING DURING LANDING CHECK. NOSE WHEEL WOULD NOT EXTEND. FOLLOWED QRH PROCEDURE. CYCLED LANDING GEAR SEVERAL TIMES WITH NO SUCCESS. USED MANUAL RELEASE TO GET NOSE LOCKED DOWN. (EMERGENCY DECLARED) R & R NLG SELECTOR VALVE IAW AMM 32-33-10. OPS AND LEAK CHECK GOOD. ( CLOSED )