As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SLAT EXTENSION, AIRCRAFT ROLLED TO THE RIGHT FOR APPROXIMATELY 2-3 SECONDS THEN ABRUPTLY STOPPED ROLL. CONSULTED MAINTENANCE CONTROL AND COM AND LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED EXCESSIVE AMOUNT OF GREASE AND SOLID FILM LUBRICANT FROM TELESCOPING DUCTS FROM BOTH LEFT AND RIGHT SIDES. CYCLED SLATS SEVERAL TIMES. OPERATIONAL CHECK GOOD.