As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA - CREW REPORTED LEADING EDGE FLAP TRANSIT LIGHT ILLUMINATED. RAN CHECKLIST WITH NO RESULTS. EMERGENCY DECLARED FLIGHT RETURNED MIA LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND SLAT NUMBER 3 INBOARD SENSOR FAULTING. REPLACED SENSOR S999. SYSTEM GROUND CHECK NORMAL OPERATION.