As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB, NUMBER 1 SLAT WOULD NOT RETRACT. AIRCRAFT RETURNED TO KMIA AND LANDED WITH NO INCIDENT. MAINTENANCE FOUND NUMBER 1 SLAT ACTUATOR FAILED IN THE EXTENDED POSITION. SLAT ACTUATOR REMOVED AND REPLACED PER B727 MM 27-81-32, OPS AND LEAK CHECK OK. NO DEFECT NOTED.