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You can service the bearings on one side easy enough. But I think when the other side is gone you have to 'send it back to Shimano' where they'll replace the internal assembly. I think buying the internal assembly part (and having a go yourself) isn't cost effective because of the price of the part.
Son can be serviced in the UK but I have no idea about SP.
miro_o
Skülly
All of the Shimano dynohubs use cup and cone bearings, no? IIRC you can back off the cones enough to regrease and/or replace the balls, but if you try and remove the whole hub centre there's a wire that's easily broken that then renders the electrics U/S.