What was found
SLAT DISAGREEMENT LIGHT CAME ON AND BLUE SLAT EXTEND LIGHT DID NOT ILLUMINATE DURNG APPROACH TO MBS. EXPERIENCED SLIGHT AIRCRAFT ROLL TO THE RIGHT. COMPLIED WITH COM PROCEDURES AND FLIGHT RETURNED TO DTW TO UTILIZE THE LONG RUNWAY. LONG RUNWAY MBS CLOSED. MAINTENANCE INSPECTION OF SLATS FOUND NO EVIDENCE OF BINDING OR MISALIGNMENT. CYCLED SLATS SEVERAL TIMES AND CHECKED GOOD. SLAT EXTEND LIGHT ILLUMINATED EACH CYCLE. AIRCRAFT RETURNED TO SERVICE.