As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH FOR LANDING AFTER SLATS WERE SELECTED TO EXTEND, THE FLIGHT CREW NOTICED THE AIRCRAFT ROLLING AND ONE SLAT DID NOT EXTEND. THE SLAT DISAGREEMENT LIGHT ILLUMINATED AND COM PROCEDURES WERE FOLLOWED. LANDING AT DTW WAS UNEVENTFUL. MAINTENANCE FOUND THE RIGHT SLAT CARRIAGE ROLLER BEARINGS DRY. LUBED BEARINGS. AIRCRAFT RETURNED TO SERVICE.