Power Steering Fluid change - how to?

[finall]

The fluid is indeed a gold color. Ok, so it looks like that is the color it is supposed to be. I thought it started as red, and as the red deteriorates, it turns golden brown, as on other vehicles I have had. So the fluid color is OK, and maybe the fluid is fine?

They replaced the "thrust bearing /pinion shaft seal in the steering gear". Then topped up with new fluid. Googling the part # comes up as:

Bearing and seal assembly – 13/16” input shaft – GM Part No. 26077989.

Called another dealer and got quoted only $100. However, going on utube shows me some "professional" machines that change the fluid. The all seem to be junk, and do not do a complete flush. They mix new fluid with old in the reservoir.

What a mess. There must be a one-way way to flush? I need info on how to do that on this particular vehicle, an H2. What to disconnect so that as much as possible of the old fluid drains as I am topping up the reservoir with fresh stuff.

Ideas and solutions?