What was found
98-0160 STA-IND: AFTER TAKEOFF AND INITIAL CLEAN UP, PASSING THROUGH 10,000 FEET FROM THE ACCELERATION TO CLIMB SPEED, THE FRONT AMBER LEADING EDGE WARNING CAME ON. PER POSITION INDICATION SHOWED THE NR 4 LEADING EDGE DEVICE AS CONSTANTLY YELLOW IN TRANSIT. AT FLAPS 15 EVERYTHING WORKED NORMAL, POSITION GREEN. RETURNED TO DEPARTURE BASE. REMOVED AND REPLACED NR 4 LEADING EDGE FLAP MICROSWITCH PER MAINTENANCE MANUAL 27-82-1 OPERATES NORMAL. OK FOR SERVICE.