As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MDW - ON FLAP EXTENSION, DID NOT GET A BLUE LIGHT AT FIVE DEGREES FLAP. THE LEADING EDGE FLAP PANEL INDICATED THE NR 4 FLAP DID NOT EXTEND. VISUAL INSPECTION IN FLIGHT INDICATED THE FLAP TO BE DOWN. AIRCRAFT DIVERTED TO ORD DUE TO A LONGER RUNWAY AND AIRCRAFT LANDED WITHOUT INCIDENT. REPLACED THE NR 4 LEADING EDGE FLAP POSITION SWITCH AND OPERATIONAL CHECK NORMAL.