As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD CREW REPORTED LE SLAT DISAGREE INDICATION IN FLIGHT. EMERGENCY DECLARED FLIGHT LANDED ORD WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND NR 3 SLAT SENSOR AT FAULT. REPLACED FLAP SLAT ELECTRONICS UNIT. SYSTEM GROUND CHECKED NORMAL OPERATION CLOSED.