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Bilstein UK used to be able to rebuild shocks. They tested on a dyno, drained the oil, changed all the seal and checked the rod. Re-valving was an option too. However, I don't know if they still offer this service and not all units can be rebuilt.
There is also a customising/motorsport service at Bilstein (de?) and can be contacted via +49 (0) 2333-791-4444
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