As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY DECLARED. FLIGHT RETURNED TO DEPARTURE, DUE TO A LEADING EDGE SLAT ASYMMETRY LIGHT ILLUMINATED AFTER TAKEOFF BETWEEN FLAPS 1 AND UP. LANDING UNEVENTFUL. ADJUSTED LEADING EDGE SLAT SENSOR SWITCH S304 IAW AMM 27-88-01. OPERATIONAL CHECKED GOOD. AIRCRAFT WAS GROUNDED.