As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DEPARTURE CLIMB UPON FLAP RETRACTION, THE NR 4 LEADING EDGE FLAP DID NOT INDICATE STOWED. RECYCLED FLAPS TO NO AVAIL, FLIGHT RETURNED TO DTW WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE NR 4 LEADING EDGE FLAP INDICATION SWITCH S205 INOPERATIVE. REPLACED SWITCH, OPERATIONAL CHECK NORMAL.