What was found
ON FINAL APPROACH AURAL WARNING "TO LOW GEAR" WITH GEAR HANDLE DOWN AND THREE GREEN LIGHTS. KILN AIR TRAFFIC CONTROL TOWER CONFIRMED THE GEAR WAS EXTENDED. CREW CONFERENCED MAINTENANCE OPERATIONS CONTROL, CPO AND MADE THE DECISION TO SHOOT THE APPROACH AND LAND INTO KILN. AN EMERGENCY DESCENT WAS DECLARED AND AIR RESCUE AND FIRE FIGHTING SUPPORT (ARFF) REQUESTED. LANDING WAS WITHOUT INCIDENT AND NO PRECAUTIONARY ARFF NTERVENTIONS. ON ARRIVAL, AIRCRAFT WAS GROUNDED FOR MAINTENANCE. UPON INSPECTION, LINE MAINTENANCE ISOLATED FAULT TO S4 MICROSWITCH IN THE LANDING GEAR LEVER MODULE INTERMITTENTLY STICKING IN THE GEAR UP POSITION WITH GEAR LEVER DOWN. IAW B767 AMM 32-31-01 AND WDM 32-61-14, REMOVED AND REPLACED GEAR LEVER MODULE ASSEMBLY. SYSTEM OPERATIONAL CHECK GOOD. NO ADDITIONAL FAULTS NOTED. AIRCRAFT RELEASED TO SERVICE.