As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DEPARTURE CLIMB UPON FLAP RETRACTION, THE NR 2 LEADING EDGE SLAT REMAINED EXTENDED WITH FLAPS UP SELECTED. NOTABLE VIBRATION WAS FELT. CREW JETTISONED 20,000 LBS OF FUEL AND RETURNED TO MSP WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE NR 2 SLAT ACTUATOR AND SLAT ASSEMBLY. OPERATIONAL CHECKS WERE NORMAL.