My alldatadiy.com account has diagrams of the valve body (but the alldatadiy terms and conditions mean I can't copy them here). But I'm not sure that it is much more detailed than you'd find in your manual. It shows the locations of check balls and springs and a rough diagram of the few hydraulic valves that it does have.
On your previous post re. what sounded like air getting in the fluid, I'd agree with whoever said to check the filter -- I would think that would be the most likely place air would get in - at the o-ring or seal around the filter neck. Air is also more likely to get pulled in when the fluid is thicker.
1998 Grand Voyager @306,000mi, 3.3L FFV V6