As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL - FLT 196 - CLIMBING THROUGH 18,000 FEET, CREW RECEIVED AN INTERMITTENT LEADING EDGE SLAT DISAGREE LIGHT. THE CREW DECIDED TO RETURN TO PHL. WHILE ON APPROACH, THE CREW RECEIVED THE EICAS MESSAGE 'FLAP/SLAT ELEC'. MAINTENANCE REPLACED THE FSEU. (X)