What was found
DURING TAKEOFF ROLL, BEFORE AIRSPEED CALL OUT, AMBER LEADING EDGE FLAP LIGHT FLICKERED. DURING TAXI BACK NR 6 LEADING EDGE SLAT GREEN LIGHT FLICKERED OFF AND ON, ON SECOND OFFICERS PANEL. CLEANED AND SECURED NR 6 LEADING EDGE SLAT POSITION INDICATOR SWITCH. OPS CHECKED OK PER MM 27-8-0.