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You should be able to block that hand pump return line with a gauge and should see no more than about 5 PSI on it while fluid is returning, if the check back to the AOP return line is opening and flowing properly...

Here is the first one I did on the hydraulic changes.

Unfortunately i cannot tell you for certain, as i removed my manifold and AOP for a larger volume hand pump years ago, before I ever played with it much. There are half a dozzen checks, depending on which valve type you have. All 3 plugs on the rearward face of the manifold are checks. One...

I think you are on the exact right track. The return path forks. One leg goes back to the hand pump reservoir. The other feeds the AOP reservoir. The AOP leg has two checks in parallel, one pointing/flowing each way. The one flowing toward the AOP has a 5PSI cracking pressure, so it should...