What was found
ORD - FLT 420 - DIVERTED ORD, NO EMERGENCY DECLARED, LANDING UNEVENTFUL. ON CLIMB-OUT, NR 6 SLAT LIGHT CAME ON ALONG WITH LEADING EDGE FLAP TRANSIT LIGHT. LIGHTS WENT OUT AFTER 30 SECONDS, THEN CAME BACK ON FOR A SHORT PERIOD OF TIME, THEN BACK OUT. NO FURTHER PROBLEMS ON CLIMB-OUT. REPOSITIONED AND CLEANED NR 6 LEADING EDGE SLAT PROXIMITY SENSOR AS PER MM 27-81-0 AND MM 27-88-11. OPERATIONAL CHECK NORMAL. (M)