What was found
PRIOR TO FLIGHT FROM PID TO MIA, PILOT REPORTED LANDING GEAR UNSAFE LIGHT ILLUMINATED AND WARNING HORN SOUNDED, BUT GEAR LIGHTS INDICATED 3 GREEN AND VISUAL INSPECTION NORMAL. AIRCRAFT WAS INSPECTED AND FOUND SAFE FOR FERRY TO FLL WITH GEAR DOWN AND LOCKED. MAINTENANCE REMOVED AND REPLACED DUAL WARNING HORN AND NOSE GEAR DOWNLOCK SWITCH. COMPLETED GEAR SWING, RESULTS GOOD. AIRCRAFT RETURNED TO SERVICE.