As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AFTER SELECTING FLAPS 30 ON LANDING, LEADING EDGE TRANSIT LIGHT STAYED ILLUMINATED. EMERGENCY DECLARED, EXECUTED A GO AROUND. LANDED SAFELY AT FLAPS 15 WITH LEADING EDGE TRANSIT LIGHT ON. REPLACED LEADING EDGE FLAP RETRACT SENSOR #3 PER AMM 27-88-11. ACCOMPLISHED SATISFACTORY OPERATIONAL TEST.