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I'd like to clarify something about trying to troubleshoot cylinder internal leakage using the isolation valves. Screwing in an isolation valve will not tell you much of anything about which cylinder is leaking. A cylinder will leak internally isolation valve open or closed. The only positive way of checking a cylinder for internal leakage is removing a hose and capping appropriately cylinder by cylinder as stated in the Lippert test sequence. You have to remember this is an open hydraulic system ... all cylinders are connected in the same loop of hoses together. The isolation valve only closes off the extend hose on each slide ... not the retract. There are no valves that operate each individual slide ... at least on current models.
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