Sounds like the down valve is worn out, the valve is located on the hydraulic manifold and is the one with wire #13 controlling the coil. Could also be coil or power to down but most likely the valve. Go online to skyjack.com and download service and parts manuals see if any valves are the same part number to swap, maybe brake cable and coil, then swap, if issue is better order new valve for brake or whatever you swapped
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