This is more a Rock Shox Revelation fork issue than a Marin issue, I suppose, except that this should be a warranty item I would think.

My recently acquired 2010 Attack Trail 6.8 does not maintain pressure in the negative air chamber. When set, it takes just a short ride or even sitting over night to reduce down to a fraction of where it was set. The preload stays exactly as set.

Has anyone else experienced this? If so, how did it play out?