As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB ON FLAP RETRACTION, AMBER LEADING EDGE LIGHT WOULD NOT EXTINGUISH. AIRCRAFT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. REPLACED THE NR 4 LEADING EDGE FLAP POSITION SWITCH. LEADING EDGE INDICATING SYSTEM OPERATIONALLY CHECKED OK.