Today, hydraulic fluid started leaking out the top of the "lifting mast" (I think that is the right term but I'm not sure). I assume there is a seal there that is shot. My main lifting cylinder seems OK. Is replacing that seal at the top of the mast something I could do myself? I'm a decent mechanic but I don't know forklifts. How big of a job is this? I'm sure I could get the seals locally but I don't want the repair to turn into a 2 day project if possible.