What was found
ON DEPARTURE, AFTER RAISING LG, WE GOT A RED UNLOCK LIGHT. FOLLOWED THE CHECKLIST, PULLED HYD PRESS CB, & HEARD A CLUNK IN THE NOSE OF THE PLANE, WE BELIEVED THE NOSE GEAR EXTENDED. BEFORE LANDING WE PUSHED THE CB BACK IN & EXTENDED THE LG. EXTENSION WAS NORMAL & LANDED UNEVENTFULLY. FOUND NOSE STRUT NITROGEN PRESS LOW. CYCLED GEAR SEVERAL TIMES BUT COULD NOT DUPLICATE DISCREPANCY. R & R NLG NITROGEN SERVICE VLV IAW CE-560XL CMM 32-20-01. SERVICED NLG STRUT IAW CE-560XL AMM 12-14-00. LEAK CHECKED GOOD, OPERATIONS CHECKED GOOD.