Ed, if it's leaking where the rod enters the cyl, I'm afraid it's not an easy or cheap fix as these units are a welded assl'y. I have heard of folks that could repair them though. Unfortunately, I do not think they are user serviceable at all.
Just to be sure, check the hose connections and the condition of them. It may be leaking at the ends and then dripping down off the end of the cyl.