What was found
ON APPROACH, NOSE GEAR INDICATED UNSAFE RED LIGHT. CYCLED GEAR HANDLE, NO HELP. VISUALLY COMFIRMED GEAR DOWN AND LOCKED. AIRCRAFT LANDED WITHOUT INCIDENT. FERRY FLEW AIRCRAFT NOSE GEAR DOWN TO PHX. REMOVED AND REPLACED NOSE GEAR DOWNLOCK SENSOR, RIGGED, AND RETRACTION TESTED OK PER BOEING M/M.