Simple: Call the manufacture. They are really really nice. You might consider sending it to them to refurbish and upgrade.
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Jperry, SOTA is about the only marque that you will not find on Vinyl Engine, and that is because the owners, the Bodinets, took issue with their copyrighted manuals and photos being show there.
They may be really nice, as Sounds_real_audio suggests, but this is not customer or hobbyist friendly behavior. And, as far as I am aware, they are the only company that had issue with this.
And for the record, I have two SOTAs but would not buy another one from them.
The MA 505 is a fantastic arm BTW and I believe that you can find a set-up manual for it on Vinyl Engine.