let the gas out of the resivour then push down on the resivour, remove circlip *new*, take out bladder, pour out fluid, push down on shock valve body, remove clip*new*, put valves in oil, replace the oil seals on shaft, repeat in reverse order, fill the shock body with new oil at a 45* angle If bled properly when assembled, put 100psi to test, push down and shock should fully extend. Or just send to a shop and just pay for oil seal replacement.
Have a great day