What was found
''L/E SLAT ASSM'' EICAS WITH FLAPS SELECTED UP, FLAP POS IND, SHOWED BETWEEN 0 & 1. RTF. *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 (PSEU) INDICATING A SLAT ASYMMETRIC CONDITION. THE ASYMMETRIC LOGIC SIGNAL ORIGINATED FROM AN OUT OF RIG SLAT POSITION SWITCH (S287) LOCATED ON THE LEFT WING, NR 6 INBOARD SLAT, OUTBOARD SWITCH POSITION. THE SUBJECT S287 POSITION SWITCH WAS CORRECTLY RIGGED PER MM AND THE SYSTEM WAS OPERATIONALLY CHECKED OK PER MM.