What was found
WHEN LANDING GEAR WAS SELECTED DOWN, NOSE GEAR GREEN DOWN LIGHT DID NOT ILLUMINATE. VERIFIED GEAR DOWN AND LOCKED. CREW PRESSED ON GEAR ADVISORY LIGHT. LIGHT ILLUMINATED AND WORKED NORMALLY FOR TWO GEAR CYCLES. CREW DID NOT DECLARE AN EMERGENCY. REPOSITIONING FLIGHT ONLY WITH NO PASSENGERS ON BOARD. MAINTENANCE PERFORMED A PSEU SELF TEST AND NOSE GEAR DOWNLOCK CODE WAS INDICATED. REMOVED AND REPLACED LANDING GEAR CONTROLLER. OPS CHECK WAS GOOD ON THREE GEAR SWINGS IAW MAINTENANCE MANUAL PROCEDURES.