I think this link you sent may have the answer to my problems: "Based on the above self-hypothesis, I concluded that the collapsing of the orifice screen occurred the instant the new hydraulic pump found its prime and began moving oil. The screen and orifice were so dirty (some big surprise there!) that no oil could pass to the regulator piston side of things to equalize pressure on both sides of the screen. Now that we had a pump capable of thousands of pounds of pressure, the screen smooshed in on itself. I am very curious as to how long that 1/2 cup of water rested in the regulator valve cavity and how it got there."
That's a good place to start.... Again, many thanks.
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