What was found
(CAN) ON APPROACH AFTER GEAR SELECTION, NLG DOORS OPENED, 'RED' INDICATION SHOWN FOR NOSE GEAR, ALTERNATE EXTENSION SYSTEM USED, AIRCRAFT LANDED NORMALLY. NO EVIDENCE OF EXTERNAL HYDRAULIC FLUID LEAKAGE, AIRCRAFT FERRIED TO BASE FOR REPAIR. INVESTIGATION FOUND NLG ACTUATOR BYPASSING INTERNALLY. ACTUATOR REPLACED, AIRCRAFT RETURNED TO SERVICE.