What was found
PHX - ON APPROACH, THE NOSE GEAR GREEN DOWN AND LOCKED INDICATOR FAILED TO ILLUMINATE ON GEAR EXTENSION. TOWER VISUALLY VERIFIED GEAR DOWN. ON GO-AROUND, FLIGHT CREW RE-LAMPED INDICATOR AT WHICH TIME IT ILLUMINATED. CYCLED GEAR, INDICATIONS NORMAL. AIRCRAFT LANDED WITHOUT INCIDENT. RE-LAMPED INDICATOR AND VERIFIED OLD LAMPS BURNED.