What was found
DURING SLAT EXTENSION ON APPROACH, THE AIRCRAFT ROLLED RIGHT WITH THE SLAT DISAGREEMENT LIGHT ILLUMINATED. INITIATED COM PROCEDURES WHEN CREW HEARD A THUD AND THE LIGHT EXTINGUISHED. LANDING AT MSP WAS NORMAL. MAINTENANCE REPLACED THE T-DUCT, O-RINGS, SLIDERS, AND PACKINGS ON SLAT SIDE BUSHING ASSEMBLY. AIRCRAFT RETURNED TO SERVICE.