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the reason for the "non-serviceable" plug, is simple that the check ball can fall out. When it does, it can cause grief. If you serviced the pump, with it standing on its input end, you won't have any problems there.
Next thing, ipr is reading 65%. Did you put the ipr solenoid on the right way. I know that is an ignorant question, but, there is the solenoid, spacer, and tin hex nut. It goes on in that manner, solenoid on first, then spacer, then hex nut. I have had one come to me with a no start after rebuild, and that is exactly what I found. Simple, yet a real mind bender.
You want to see high ICP when cranking, and during initial fire, then it will drop off to idle values. I have seen these across the board on idle, from 500 - 700 psi. No start will be attempted until min 750 is reached, if I remember right.
It has been a while since I last worked on one of these, something else to check, is that you got the drive gear bolt tight on the input shaft of the HPOP. this will definitely cause a no start.
Report back on what you find.