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Servicing my Lyriks I just used the same weight of oil that goes in the lowers to soak the seals and Juice Lubes bearing grease for everything else. I don't think that Red Rum or the Judy Butter is available any more. Rock Shox (if you really want to use their approved stuff) sell PM600 military grease for many service jobs including fork servicing. I haven't done a shit ton of fork servicing but so far haven't found purchasing that necessary.
But @BareNecessities has some good advice: try to find out the condition of the forks first, such as the bushings. If there is a lots of play in the stanchions then servicing them will be pointless (when bushings go most places I have dealt with either replace the lowers or the entire forks). If there is a lot of scoring on the stanchions then servicing might be pointless.
Coolio - instructions talk about Red Rum and Judy Butter. Where would one buy these products - they don't seem to be available on the regular cycling mail order shops (or I've fucked up searching).