What was found
L/E SLAT ASSYMETRY EICAS MESSAGE DISPLAYED WHEN FLAP LEVER SELECTED TO 1. DIVERTED TO JFK. *S/D* SLAT MOVEMENT WAS INHIBITED BY THE FLAP/SLAT ELECT UNIT (FSEU) WHEN IT RECEIVED A SLAT POSITION LOGIC SIGNAL FROM THE PROXIMITY SWITCH ELECT UNIT INDICATING A SLAT ASYMMETRIC CONDITION. THE ASYMMETRIC LOGIC SIGNAL ORIGINATED FROM A FAILED SLAT POSITION SWITCH (S303) LOCATED ON THE RIGHT WING, NR 9 SLAT, INBOARD SWITCH. THE SUBJECT S303 POSITION SWITCH WAS REPLACED WITH A NEW SWITCH. THE SLAT SYSTEM WAS OPERATIONALLY CHECKED OK PER MM 27-88-06. AS PRECAUTION, THE FSEU WAS REPLACED PER MM 27-51-01.