lift arms drift down a couple inches when letting go of joy stick. barely pull joystick back to lift arms, and they'll actually go down versus up. pull back all the way, ad the go up. let go they'll drop an inch or 2 every time. has new joystick control, and relief valve. any help would greatly appreciated!
Have you checked for internal cylinder leak? How many hrs on machine?
A Serial Number would also be a help to identify exactly which of the 11 different models of 257 you actually have.