What was found
(CAN) ON FINAL APPROACH, SELECTED GEAR DOWN. NOSE GEAR DOORS DID NOT OPEN AND THE NOSE GEAR RED LIGHT REMAINED ILLUMINATED WITH THE NOSE GEAR GREEN LIGHT OUT. EXECUTED A MISSED APPROACH AND THE GEAR RETRACTED NORMALLY. RESELECTED GEAR DOWN AND GEAR EXTENDED NORMALLY AND LANDED UNEVENTFULLY. AIRCRAFT WAS GROUNDED UNTIL A NLG INSPECTION AND GEAR SWINGS COULD BE ACCOMPLISHED. THE NLG INSPECTION FOUND THE NLG DRAG BRACE KNUCKLE HAD VERY LITTLE LUBRICANT. NLG DRAG BRACE KNUCKLE LUBRICATED AND NUMEROUS GEAR SWINGS ACCOMPLISHED, NLG SYSTEM COULD NOT BE FAULTED. AIRCRAFT RETURNED TO SERVICE.