What was found
BOI FLIGHT 2389: WHEN SELECTING THE GEAR UP LEAVING SMF, THE RED NOSE GEAR UNSAFE LIGHT AND GEAR HANDLE LIGHTS REMAINED ILLUMINATED. THE AIRCRAFT WAS DIVERTED TO PDX AND UNEVENTFULLY PUT THE GEAR DOWN USING THE ALTERNATE GEAR EXTENSION. MAINTENANCE REMOVED THE NOSE LANDING GEAR DOWN AND NOSE LANDING GEAR LOCK PROX SENSOR IAW Q400 AMM 32-61-06-000-802. INSTALLED NEW/SERVICEABLE NLGDN1 (3261-S09) PROX SENSOR ASSY AND NLGLK1 (3261-S11) PROX ASSY IAW Q400 AMM 32-61-06-400-802. PERFORMED LANDING GEAR, OPS CHECK IAW Q400 AMM 32-31-00-710-801 TR 32-186. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.