I received a 1985 Viking PUP from a friend this weekend. It's in pretty decent shape, except for some water damage in the ceiling and a fragile, musty canvas. We'll have to replace that. I don't have any paperwork for it. It there some standard maintenance schedule out there that says how to use it? How often to lube the lift system, tighten the lug nuts... I don't want to neglect something that I just didn't know about. Thanks!