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, THE NR 3 LEADING FLAP DID NOT INDICATE UP AND LOCKED. AIRCRAFT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. REPLACED LEADING EDGE POSITION INDICATOR AND STRAIGHTENED NR 7 PIN ON CANNON PLUG OF NR 3 LEADING EDGE SWITCH, OPERATIONAL CHECK OK.