Keep an eye on the shaft seal area for weepage. That is a sign that a seal is going bad. Also with that. If there is weepage. The gas is gone inside the shock/coilover as the seal is worn and the gas has escaped. If the seal is not weeping. You have to remove the shock from the car and push/pull it through is range of travel checking for any easy/hard spots. A shock will normally wear the cylinder in one small area in it's travel stroke. Anything out of that area will feel different.
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