What was found
MDW-STL DURING TAXI OUT WHILE EXTENDING FLAPS TO POSITIONS, NR 1 L/E FLAP WENT TO AMBER ON EXT AND WOULD NOT ILLUMINATE GREEN, FLAPS POSITIONED UP AND DOWN WITH NO HELP. MAINT ADVISED FLAPS APPEARED TO BE IN NORMAL POSITION. RETURNED TO GATE. REPLACED TERMINAL END TO NR 1 KRUEGER FLAP GROUND STUD PER M/M, ALL CKS NORMAL.