As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH, EXTENDED LANDING GEAR AND RECEIVED A GEAR DISAGREE EICAS. THE NOSE GEAR LIGHT WAS NOT ILLUMINATED. COMPLIED WITH QRH PROCEDURES AND USED THE ALTERNATE GEAR EXTEND SWITCH. UNEVENTFUL LANDING WITH GEAR DOORS LIGHT ILLUMINATED. REMOVED AND REPLACED THE NOSE GEAR DOOR SEQUENCE VALVE IAW AMM 32-34-05-4.