AFI MEWP Emergency Lowering videos JLG J450AJ, J450AJS

Before operating a MEWP view our Emergency Lowering video for JLG J450AJ, J450AJS.
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But what is the main reason the mid and upper booms will not lower even when performing the emergency override? It goes up but not down on those two cylinders and the lines pressurize and motor labors like it’s dead heading