Steering Gearbox on SL500 is leaking

[Gusfazekas]

I bought this SL a year ago and only now I am finding out the little problems with it. The steering gearbox is leaking oil, anyone know how difficult a job it is to remove it? How about the rebuilding or replacing the seals? There are a bunch of allen head type screws on it and I wondered if anyone has done this. How much oil does this thing hold and is it possible to run it dry? how about refilling it, is that possible without taking it off? I know these are a lot of questions, but I don't have a manual and the info I do have isn't detailed enough. Thanks, Steve