I am unaware of any shop that rebuilds Patec shocks. Most race shops that do suspension rebuilds, revalves, or shortenings would probably consider these to be throw aways. I have never heard of anyone that has had these ever having them rebuilt. You may want to check out vwvortex and ask on there. If it was a Koni, Penske, Ohlins, Bilstein, or the like I could point you in the correct direction.