As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO THE FIELD AT MIA DUE TO A LEADING EDGE SLAT ASYMMETRY MESSAGE. *S/D* THE LEADING EDGE SLAT ASYMMETRY MESSAGE WAS CAUSED BY AN OUT OF LIMIT SENSOR TO TARGET GAP CONDITION ON NUMBER 8 SLAT OUTBOARD PROXIMITY SENSOR S298. THE SENSOR TO TARGET GAP WAS ADJUSTED PER MM 27-88-01, OPERATIONS CHECK NORMAL.