What was found
DURING CRUISE AT FL400, LANDING GEAR UNLOCK LIGHT ILLUMINATED FOR APPROXIMATELY ONE MINUTE. DURING DESCENT THE LANDING GEAR UNLOCK LIGHT CAME ON & THE NOSE GEAR DOORS MADE AN ATTEMPT TO OPEN. JACKED AIRCRAFT, AND PERFORMED INITIAL GEAR SWINGS, NO DEFECTS WERE NOTED. OHMED ALL THREE GEAR UP LOCK SWITCHES. FOUND THE RT UPLOCK SWITCH TO HAVE AN ERRATIC & INTERMITTENT RESISTANCE OF UP TO 75OHMS BETWEEN PINS A&B. REMOVED THE RT MLG UPLOCK SWITCH AND INSTALLED A NEW UPLOCK SWITCH. PERFORMED GEAR SWINGS AND RIGGED SWITCH. OPS CHECKED GOOD IAW MM 32-60-00.