What was found
INSPECTION TYPE:N/A, DURING CLIMB AT FL 180 ORANGE LED LIGHT CAME ON NR 4 LED WAS OUT. SELECTED FLAP 2 DEGREE, NO GREEN LIGHT. RETRACTED FLAPS AND LIGHT EXTINGUISHED. SHORTLY THEREAFTER AMBER LIGHT ILLUM, 4-5 MIN LATER LIGHT EXTINGUISHED. AFTER CREW DEBRIEF FOUND CRES REFERRING TO NR 4 L/E FLAP INICATION. CYCLE D-FLAPS TO 2 THEN 5 COULD NOT DUPLICATE. INSPECTED ALL LEADING EDGE DEVICES. FOUND NR 4 L/E FLAP POSITION SWITCH CANNON PLUG BACKSHELL LOOSE. SECURED SAME.