What was found
FLIGHT 485 BIL/LAS, THE FLIGHT CREW REPORTED THAT THE AUTOSLAT FAIL ANNUNCIATOR ILLUMINATED ON APPROACH WHEN FLAPS 15 WAS SELECTED. LAS VEGAS MAINTENANCE REPORT THAT TROUBLESHOOTING REVEALED FLAP/SLAT POSITION SWITCH S1-467 HAD FAILED. LAS VEGAS FURTHER REPORT THE REMOVAL AND INSTALLATION OF THE FLAP/SLAT POSITION SWITCH AT THE FLAP SELECT LEVER PER AMM 27-80-07. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED PER AMM 27-80-07. THE AIRPLANE HAS RETURNED TO SERVICE.