As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB UPON FLAP RETRACTION, THE NR 8 LEADING EDGE SLAT REMAINED EXTENDED. UNABLE TO RETRACT SLAT. RETURNED TO MSP WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE NR 8 LEADING EDGE SLAT ACTUATOR. LEAK AND OPERATIONAL CHECK NORMAL.