As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 1442 - NOSE GEAR UNSAFE LIGHT (RED) ON THROUGH CLIMB-OUT AND INTERMITTENT FLASHING IN CRUISE. INITIAL GEAR UP HAD THE LIGHT OUT. QRH PROCEDURES FOLLOWED. LIGHT STILL INTERMITTENT ON. REMOVED AND REPLACED NOSE GEAR UP POSITION (D1-31) PROXIMITY SENSOR. OPS CHECK NORMAL. (M)