As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT INTO GRR, SLAT DISAGREEMENT LIGHT ILLUMINATED. FLIGHT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. FOUND RIGHT LEADING EDGE SLAT T-DUCT ALIGNMENT BLOCKS BINDING ON TELESCOPIC TUBE. REPOSITIONED UPPER AND LOWER BLOCKS AND CYCLED SLATS NUMEROUS TIMES, OPERATIONAL CHECK OK.