Leaking from where? If it's through the seals that the ram runs through, and the ram itself is in good shape (no pitting, rust, etc), you can replace the end caps with seals for about $50 (which would actually be really expensive, I think.)
Not sure what seals HydroFlex uses, but I doubt they'd be anything but standard hydraulic seals (which will run a couple of bucks a piece from a non-marine hydraulic shop.)
jky
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