This is going to be one of those rare times that I will disagree with Rod. Based on everything you have told me, I suspect rear pump damage, either blown seals and/or worse. I’ve seen this happen in a similar situation. Whoever shimmed the valve with a ball bearing was a moron, and the resultant EXTREME high pressure I’m sure likely damaged the pump and broke the clip at the same time. I also suspect some DP damage based on your differences in readings between high and low.
If you put in a new factory valve assembly, I would be reasonably certain that it is shimmed properly. I would remove the hydraulic pump and take a close look at the REAR pump, which supplies oil for the PTO/4WD/DP circuits. There is also a special fitting available whereby you can pressure and flow test this pump directly. However, it would be quicker to simply remove the pump and disassemble it. That is your quickest option at this time.
Any access to the PTO valve at this point, is, like Rod says, likely best done thru the top cover. If the tractor does not have Load Monitor (a 10-series option), this is also the easiest and safest way to R&R the PTO clutch assembly.
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