What was found
LEADING EDGE ASYMMETRY ILLUMINATED DURING FLAP RETRACTION, FLAPS HALTED BETWEEN 1 AND UP. RESULT WAS ALTERNATE FLAP 20 EXTENDED LANDING. RETURNED TO FIELD. *S/D* THE POSITION SENSOR ELECTRONIC UNIT DETECTED AN ASYMMETRY CONDITION DUE TO A FAILED LEADING EDGE SLAT POSITION SENSOR. THE ASYMMETRY CONDITION SIGNAL LATCHED IN THE FSEU AND THE FLAP/SLAT FAILURE PROTECTION SYSTEM WAS ACTIVATED INHIBITING NORMAL FLAP/SLAT MOVEMENT. THE LE POSITION SENSOR S298 WAS REPLACED AND ADJUSTED. PER MM FLAP/SLAT SYSTEM WAS OPS CHECKED AND VERIFIED NORMAL .