What was found
KOA - FLT 247 - AIRCRAFT WAS UNABLE TO RAISE LANDING GEAR (NOSE), GEAR (RED) LIGHT REMAINED ON WITH GEAR HORN. ON RETRACTION, AIRCRAFT RETURNED TO KOA, WHERE A SUCCESSFUL LANDING WAS MADE. FERRIED A/C BACK TO HNL, CHECKED NOSE GEAR FOR CONDITION AND SECURITY FOUND NOSE STRUT LOW. SERVICED NOSE STRUT AND REPLACED SCHADER VALVE. RETRACTION CHECK OK. NOSE STRUT SERVICED PER MM 32-21-2. B METHOD. (M)