Ghost in Our Cardinal??

Something is leaking. My 2005 Cardinal LX (built April 2004) has three slides. The hydraulic controls located near the pump allows isolation of each slide. Presumably so each slide can be controlled separately. I would pull in all the slides and turn off that problem slide's valve. If that same slide still creeps out, then I would assume the problem is in that part of the system. I would suspect air in the system through connections or slide cylinder. If the slide does not creep, then I would suspect the air leak is in one of the other slides cylinders or connections. Perhaps just the lightest or more inclined slide is moving. I don't believe in ghosts, but I know a sealed static hydraulic system should not move. Soapy water on connections and cylinder ends may help find the leak. Hope this helps you. My 2 cents.