The 5000 series is a gear type pump isn't it? If the problem is with the pump I expect you could rebuild it. A screen on the oil inlet to the pump can get a buildup of crude and starve the supply and create low pressure on some tractors. Are you positive that you have the correct oil in the hydraulic system? When you say the pressure drops as the oil warms have you any idea as to what the temp of the oil is reaching? Does the 5000 have an oil cooler at the radiator? If so, how much debris is built up around the cooling coils? Are there any unusual noise coming from within the tractor such as a squealing sound? A remote valve with the control lever in the wrong position will over heat the hydraulic oil and lower the pressure. That spring is about the only thing to go wrong there. You could verify that the spring in the relief valve has not broken. Since the relief valve is holding at 1500 with cold hydraulic oil and dropping as the oil temp rises. IMO is is unlikely to be the relief valve.
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