DT Swiss rear schock service

Anyone serviced a DT Swiss XM180 shock themselves. I can find no info on the net, unlike for FOX or Rock Shox. The only company that I found is PACE, they charge £80 + pp, guess mostly labour, as a service should only require some oil, a few bushings/seals.
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Probably better to let Pace do it. After all £80 + pp isn't much to pay for servicing something that costs the better part of £400.