As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLAP RETRACTION, THE NR 1 SLAT AMBER LIGHT ILLUMINATE ON SECOND OFFICER'S PANEL. VISUAL CHECK SHOWED NR 1 SLAT DID NOT RETRACT. AIRCRAFT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. REPLACED NR 1 SLAT ACTUATOR, PERFORMED FLAP/SLAT LEAK AND OPERATIONAL CHECK, CHECKED OK.