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The only specialist tool you need is a large ring spanner to remove the plastic lock ring. Remove this, and the NDS lock nut and cone, the the whole internal body can be removed from the shell. A good clean of the internals and the inside of the shell, followed by a thorough lubing of the internals by an oil bath, is all it needs.
Didn’t Sheldon Brown drill a hole in the hub body to be able to oil a nexus/ Alfine easily, old sturmey style.
How is the servicing? It looks to be a bit of a specialist tool pain.