As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED A GEAR DISAGREE MASTER WARNING. MANUALLY EXTENDED GEAR. (FLIGHT NR 3856) REPLACED NOSE DOOR SELECTOR VALVE IAW MM 33-22-20 AND LANDING GEAR CONTROL HANDLE IAW MM 32-31-01. PN 750006000 S/N OFF 0034I P/N OFF 7-45502-5 S/N OFF 1182.