What was found
KDET - KIND DURING APPROACH TO RUNWAY 32 IN KIND, THE GEAR HANDLE LIGHT REMAINED ILLUMINATED RED WITH ALL THREE GEAR INDICATORS SHOWING DOWN AND LOCKED. GEAR WAS CYCLED THREE TIMES WITH THE SAME RESULTS. THE TOWER HAD CONFIRMED AT LEAST ONE MAIN GEAR DOOR WAS NOT UP. EMERGENCY PROCEDURES WERE USED TO BLOW THE GEAR DOOR TO THE UP POSITION. THE PROCEDURE RESULTED IN THE GEAR HANDLE LIGHT EXTINGUISHING, AND THE DOORS BEING UP. AN UNEVENTFUL LANDING WAS MADE IN KIND. MAINTENANCE REPLACED THE LEFT MAIN GEAR DOWNLOCK SWITCH. OPERATIONAL CHECKS WERE GOOD. AIRCRAFT WAS RETURNED TO SERVICE.