As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT ON APPROACH THERE WAS A NR 4 SLAT IN TRANSIT PROBLEM. EMERGENCY DECLARED LANDED MIA WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND THE NR 4 LEADING EDGE SLAT ACTUATOR LEAKING. REPLACED THE NR 4 LEADING EDGE SLAT ACTUATOR. SYSTEM GROUND CHECK NORMAL OPERATION. (CLOSED)