What was found
AIRCRAFT WAS GROUNDED: AT FL360 NUMBER 1 SLAT IN TRANSIT LIGHT ILLUMINATED LEADING EDGE FLAP TRANSIT LIGHT ILLUMINATED. ACCOMPLISHED QUICK REFERENCE HANDBOOK ITEMS. AFTER APPROXIMATELY 1 HOUR, BOTH LIGHTS EXTINGUISHED. EMERGENCY WAS DECLARED AND RETURNED TO DFW. AIRCRAFT WAS NOT OVERWEIGHT FOR LANDING. ACCOMPLISHED FLAP/SLAT ELECTRONIC UNIT BUILT IN TEST EQUIPMENT PER FIM 27-51-00-810-801. FOUND FAULT 27-81230. ACCOMPLISHED FIM 27-88-00-810-808 FOR SL7 PROXIMITY RETRACT SENSOR. NO FAULT NOTED. ACCOMPLISHED OPERATIONAL TEST PER AMM 27-88-00. TEST GOOD.