I take it your working on a 5000 series reach. RR5200 maybe?
If so the first thing I would have said would have beed a stuck SVE on the man block, but since you changed the whole block, I might say P-1. I've seen a lot of P-1 failures lately. Symptoms have been no accessory functions unless you turn on P-2 (or on 24 volt systems crank up P-1 speed) & hard steering. If your a Crown tech you know how to see what kind of pump you have ( variable or standard ). I'd put my money there. Feel free to send mod and ser #. How many hours on it?
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