As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DTW - FLT 220 - AFTER TAKEOFF WHEN LANDING GEAR WAS RETRACTED, RT MLG AND DOOR LIGHTS REMAINED ILLUMINATED. CYCLED LANDING GEAR. FOUND RT MLG DOOR SWITCH AND TARGET DIRTY. CLEANED DOOR SWITCH AND TARGET. DOOR LIGHT INDICATION THEN CHECKED NORMAL. CHECK C - 4-9-95 - MCI.