What was found
MAD - FLT 730 PHL TO MAD. DURING APPROACH, THE FLAPS AUTOMATICALLY LOCKED AT 20 DEGREES DUE TO A LEADING EDGE SLAT ASYMMETRY WARNING. THE CREW DECLARED AN EMERGENCY, ACCOMPLISHED QRH PROCEDURES, AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE PERFORMED A BITE CHECK OF THE FSEU, AND OPERATED THE SLATS/FLAPS OVER A FULL RANGE. NO DEFECTS WERE NOTED. ALSO, THE PHYSICAL INSPECTION OF THE SLATS IN THE DEPLOYED POSITION REVEALED NO DEFECTS. OK FOR SERVICE.