What was found
AFTER TAKEOFF UNABLE TO MOVE GEAR HANDLE TO UP POSITION. SHORTLY AFTER TAKE OFF WOW MISCOMPARE CAS ILLUMINATED, 5 MINUTES LATER EXTINGUISHED THEN UNABLE TO MOVE HANDLE UP BUT LT MAIN REMAINED DOWN W/RED UNLOCK. CHECKED NITROGEN PRESSURE IN NLG STRUT AND FOUND NONE. DISASSEMBLED, CLEANED, INSPECTED NR REPACKED NLG STRUT WITH NEW SEALS AND GASKETS IAW CHAPTER 32-20-00 OF THE CE-680 MM. SERVICED; OPS CHECK, LEAK CHECK SATISFACTORY.