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If you've went thru the cycling of the slides several times and the slide creep still exists, I'd say you have a cylinder piston seal failure. When you draw the slides closed, there is fluid pressure but not alot of fluid volume holding the slides closed. When a piston seal leaks, it allows the pressurized side to bleed past to the extend side of the piston thus pushing that cylinder out until the pressure tends to equalize. Like I asked before, does just one slide creep or does more than one creep?
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