What was found
NOSE GEAR DOWN AND LOCK INDICATOR FAILED TO ILLUMINATE WITH GEAR SELECTED DOWN (GEAR WAS DOWN). INSPECTED ALL 3 LANDING GEARS, INSPECTED CONNECTOR GOING FROM DOWNLOCK SWITCHES TO AIRCRAFT. CHECKED FOR HYDRAULIC LEAKS, AND FLUID LEVEL FOR POWER PACK. VISUALLY INSPECTED CONNECTOR RECEPTICAL, FOUND NOSE LANDING GEAR RECEPTICAL CONTAMINATED WITH DIRT. CYCLED GEAR SEVERAL TIMES IAW MANUAL, PROBLEM COULD NOT BE DUPLICATED.