What was found
AT FLAPS 1 SELECTION FLAPS MOVED TO 1 POSITION & GOT EICAS MESSAGE LE SLAT DISAGREE. RAN QRH PROCEDURES, AFTER MOVED THE ALTERNATE FLAP SELECTOR THE EICAS MESSAGE WENT AWAY. REF TSI 27-80 1381 WRI 27-80 1391, 27-80 1389, 27-80 1390 FOR TROUBLESHOOTING AND PARTS INFO. BASED ON TROUBLESHOOTING THREE LEADING EDGE SLAT ROTARY ACTUATORS WERE FOUND TO BE TRIPPED. THREE ACTUATORS IN POSITIONS #9 #12 AND#15 WERE REPLACED IAW AMM 27-81-18-4. OPS CHECK SATIS AND NO MESSAGES PRESENT DURING OPERATION OF LEADING EDGE SLATS. AIRCRAFT OK FOR SERVICE.