As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR AIR/GROUND FAIL EICAS MSG AFTER DEPARTURE. INSPECTED AND FOUND NITROGEN SCHRADER VALVE TO BE LEAKING NITROGEN. R2 VALVE LEAK CHECK GOOD. PERFORMED GEAR SWING. OPS CHECK GOOD, BEFORE R & R VERIFIED VALVE WAS SEALED AND CLOSED, LEAKING INTERNALLY.