What was found
DURING LANDING GEAR EXTENSION, NOSE GEAR UNSAFE LIGHT ILLUMINATED. NO DOWN, GREEN LIGHT. NOTE: MANUAL GEAR EXTENSION PROCEDURE COMPLETED EMERGENCY, DECLARED WITH ATC. TROUBLESHOT LANDING GEAR POSITION INDICATING SYSTEM IAW M.M. FOUND FAULTY NOSE LANDING GEAR LOCK SWITCH. REMOVED AND REPLACED NOSE LANDING GEAR LOCK SWITCH IAW MM. ADJUSTMENT/TEST, LANDING GEAR LOCK AND POSITION SWITCHES IAW MM, NOSE GEAR INDICATIONS NORMAL..