What was found
AFTER TAKEOFF, LANDING GEAR HANDLE WAS SELECTED UP. GEAR REMAINED DOWN WITH THREE GREEN & RED UNLOCKED LIGHT CAME ON. AFTER APPROXIMATELY ONE MINUTE, GEAR CAME UP & ALL THE LIGHTS WENT OUT. JACKED ACFT & CYCLED LANDING GEAR WITH NO FAULTS. CHECKED MLG OLEOS & NOSE STRUT NITROGEN PRESSURE & FOUND THE NOSE STRUT PRESSURE LOW AT 265 PSI. SERVICED NOSE STRUT TO CORRECT PRESSURE. CYCLED LANGING GEAR SYS, OPS CHECKED GOOD IAW MM 32-00-00.