As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN SLATS WERE DEPLOYED AT 250 KTS, THE AIRCRAFT ROLLED TO THE RIGHT AND THERE WAS NO BLUE SLAT EXTEND LIGHT. CREW CYCLED THE SLATS BACK UP NORMALLY, RE-DEPLOYED AND THE AIRCRAFT ROLLED AGAIN. AFTER A FEW SECONDS THE BLUE LIGHT ILLUMINATED AND THERE WAS LESS TENDENCY TO ROLL. LANDING AT MCI WAS UNEVENTFUL. MAINTENANCE FOUND THE LEFT T-DUCT SLOW. REPLACED THE LEFT -T- DUCT. AIRCRAFT RETURNED TO SERVICE.