What was found
INSPECTION TYPE: N/A ATB-EMERGENCY DECLARED LANDED WITHOUT INCIDENT WITH A FLAPS 20 LANDING. LE SLAT DISAGREE EICAS MSG AND LEADING EDGE LIGHT ILLUMINATED WHILE RETRACTING FLAPS ON TAKE OFF RETURNED TO PIT. PERFORMED FLAP/SLAT ELECTRONIC UNIT (FSEU) BITE W/FIM 27-51-00-815-805 CONFIRMED FSEU 1 MSG 310 FSEU 2 MSG 331 "SLAT DISAGREE". CORRECTIVE ACTION REQUIRED FIM 27-81-00 C/W FIM 27-81-00. FOUND NR 1 LE SLAT ROTARY TRIP IND TRIPPED. 757 MM 27-81-18-706-001 "INSPECTION OF ROTARY ACT" RESET NR 1 LE SLAT ROTARY ACT TRIP IND & CYCLED SLATS, ACT TRIP IND REMAINS SET.