What was found
NOSE GEAR DOOR LIGHT CYCLED ON AND OFF CONSISTANTLY FOR ROUGHLY 20 MINS IN THE CLIMB OUT. DID NOT NOTICE AT WHAT EXACT POINT IT CAME ON. ONCE DECISION WAS TO TURN AROUND WAS MADE. THE LIGHT DID NOT CYCLE AGAIN. RETURNED TO FIELD. LANDING UNEVENTFUL. AIRCRAFT REMOVED FROM SERVICE. RIGGED THE NOSE GEAR DOOR CLOSED PROXIMITY SENSOR IAW AMM 32-61-06-830-801, OPS CHECKED GOOD, NOSE GEAR DOOR LIGHT STAYED OUT WHEN DOORS WAS CLOSED AND INDUCTANCE VALUES WAS WITHIN LIMITS. RETURNED TO SERVICE. NO PARTS REPLACED.