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Yes, the pressure will normally bleed off slowly.

It's important that they measured the flow correctly or the numbers are misleading. Like oldnslo said, the flowmeter needs to be hooked directly to the pump outlet, not somewhere downstream, and the outlet of the flowmeter should go directly back to reservoir and not through any other plumbing...

To accurately diagnose a hydraulic issue you need to measure both flow and pressure, not just one or the other. A pump can put out enough flow under low or no pressure to make it look like it's OK, but when you start building pressure with the oil at operating temp, the flow should not drop by...

The hydraulic pump and steering pump are located on the side of the engine so they are easy to change. There is nothing else related to the pump that would involve adding third function. You should do a 250 hour service and change the hydraulic oil as long as you are replacing the pump. It...