this question may have been asked in the past , but here goes anyway.......what exactly fails in the accumulators? is it the diaphragm ? does the nitrogen charge leak out? has anybody attempted repairing them? aircraft hydraulic accumulators are similar in function with the advantage of having schrader valves which allow for topping up the nitrogen from time to time . on aircraft they sit around 1500 psi and have a separator piston with "o" ring and two teflon back -up rings separating the gas from the fluid could this be a replacement solution?