It looks like the charge pump is moving oil.
And you obviously had the pump fully swashed, forward and reverse?
I'd work backwards from the pinion. How is it coupled to the motor output shaft?
Did you remove the spring pins in the pump swash plate to check that they're not sheared?
I've often seen a lens plate that did not make full contact with the head. It only has to be off a few thousands, usually because a locating pin was holding it up. Some Sundstrand's had two dowel pins, one being round and one having flat sides to go in a slot.
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