What was found
AFTER START AND TAXI, LE FLAPS NR 4L WOULD NOT EXTEND FROM AMBER, ALT SYSTEM ATTEMPTED, STILL REMAINED AMBER. NR 4L LE FLAP IND GREEN UNTIL TAKEOFF POWER SETTING APPLIED, IND WENT AMBER, ALSO TAKEOFF WARNING HORN SOUNDED. INSPECTED CLEANED IND SWITCH ASSEMBLY CYCLED, LE FLAPS OPS CHECK NORMAL. FOUND CARD A-5 IN LE FLAP POSITION MODULE LOOSE, RESEAT CARD, OPS CHECKS GOOD, ALL IAW MM 27-81-01 AND 27-88-01.