If it has all ways drops on the same ram I would suspect the corresponding valves leaking back .
It's an easy part to change. Look on your hydraulic pump while simultaniously checking the manual on instructions to manually retract the legs.
Where in the manual it says use an Allen key to open the valve..... this is the part that needs replacing.
Depending on model may look like this
https://www.google.com/url?sa=i&sour...46674171801720
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