As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHEN GEAR SELECTED UP AFTER TAKEOFF, ALL BUT THE NOSE GEAR INDICATED UP AND LOCKED. DOWN SELECTION MADE AND ALL GREENS. CREW RETURNED AND LANDING OK. THE NOSE LANDING GEAR CENTERING ACCUMULATOR FOUND LOW IN NITROGEN BECAUSE OF A LEAKING SCHRAEDER VALVE. VALVE CLEANED AND ACCUMULATOR TOPPED UP.