What was found
CREW REPORTS LEADING EDGE FLAP TRANSIT LIGHT AFTER TAKEOFF. OVERHEAD INDICATOR FOR NR 3 LEADING EDGE FLAP INDICATING NOT RETRACTED. FOLLOWED FIM 27-88 TASK 820 AND COMPLETED FSEU BITE CHECK, PASSED. LOOKED AT PREVIOUS FAULT HISTORY LEG 0 HISTORY SHOWS F3 PROX RETRACT MAINT MESSAGE 27-81220. WHICH VALIDATES PILOT WRITE UP. PILOT BROUGHT AICRT TO GATE WITH FLAPS DOWN PLACED FLAPS BACK TO POSITION 0 WITH NO FAULTS AT THIS TIME. IAW AMM 27-88-11-400-802 STATES THAT THE RETRACT SENSOR IS NON ADJUSTABLE STAINLESS STEEL AND (5) FOR TITANIUM. DUE TO F3 PROX RETRACT MAINT MESSAGE 27-81220 ACCOMPLISHED STEPS E. THRU F.(1)(F) OF FIM 27-88 TASK 805. NO CURRENT FAULTS FOUND, LOOKED AT HISTORY FOUND SAME MESSAGE AS BEFORE ON FSEU. EXTENDED & RETRACTED SLATS, MOVEMENT WAS SMOOTH AND EVEN ON BOTH SIDES. REPLACED NR 3 LEADING EDGE FLAP RETRACT SENSOR (S172) AS A PRECAUTION IAW MM 27-88-11-400-802, PERFORMED LEADING EDGE FLAP & SLAT PROXIMITY SENSOR TEST IAW AMM 27-88-11-700-801. CHECKED SENSOR FOR F3 RETR. WITH FLAP CONTROLLER LEVER IN RETRACT, OPSERVED GAP NEAR. WITH LEVER AT 1 UNIT, OBSERVED GAP FAR. WITH LEVER AT 10 UNIT OBSERVED GAP FAR . INDICATOR AND OPS CHECK WERE GOOD AT THIS TIME.