If they checked the pressure at the Selective control outlets this just tells you the system pressure is at 2500 PSI. It does not tell you what the pressure is on the three point system. It has its own control valve and relief valve. Plus the three point lift cylinder can be leaking under heavy loads.
I am not familiar enough with an IH or CIH 785 to know if you can get a pressure reading on the three point lift cylinder under load. The larger JD tractors are easy to check this on but the utility tractors can't be checked under load. So yours could be either way.
I would bet that the lift cylinder just needs rebuilt. The piston sliding in the cylinder bore will wear the seals. So this is wear item.
If you shut your tractor off does the three point arms go down fast when under load?? I never worry if they go down over night but they should stay up for a few hours without any settling.
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