What was found
PER CREW VERBAL: NR 3 SLAT IND INTERMITTANT, BOTH OVERHEAD & FWD PANEL LIGHTS. CREW DEBRIEF, LANDING WEIGHT WITHIN LIMITS. PILOT STATED: L/E FLAP TRANSIT ON DEPARTURE MOMENTARLY, FLAPS CLEAN, RETRACTED. DURING CRUISE LE FLAP TRANSIT LIGHT ILLUMD. OVERHEAD NR 3 SLAT SHOWED IN TRANSIT. ACFT DIVERTED TO IAH. IN DESCENT TO IAH LE FLAP TRANSIT WENT OUT. PERFORMED BITE OF FSEU REF FIM 27-51,TASK 801 FAULT SHOWN 27-81205, INTERMITTENT, SLAT 3 PROX INBD. PERFORMED FIM 27-88-804, FOUND L/E INBD SENSOR S999 WITH EXTENSIVE HISTORY. ALL INPUTS TO FSCU FROM PROX SENSOR AT DIFFERENT SLAT POSITIONS WERE GOOD & ALL WIRING CHKD GOOD. AS A PERCAUTION R & R SENSOR S999 IAW AMM 27-88-11. OPS CHKD GOOD. OK TO CONTINUE