If the hydraulic controls work poorly, slowly, the problem is either from the gaskets in the hydraulic cylinders that are worn, or inside the PHS valves. I had both problems, and look what breaks inside the valves, for those who don't know. Those rings give way and the pressure is released. It's a little tricky to get to them because the circuit strip has to be removed, and after repair it has to be re-soldered
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