Code 1-8, Accumulator Gas Leakage

Ensure relief plug on accumulator is tight. Ensure relief plug "O" ring is not out of place or defective. Using ABS "T" Wrench (07HAA-SG00100), bleed high pressure fluid from maintenance bleeder screw. See RELIEVING ACCUMULATOR/LINE PRESSURE  under BLEEDING BRAKE SYSTEM. If no fluid bleeds from accumulator, all nitrogen gas has likely leaked out of accumulator.