GAmes, did you access the valve body from underneath the truck?
Yes
What does the procedure consist of? Remove the high pressure line, then remove the main fitting, then remove and clean the filter screen and reinstall?
Yes, 18 mm wrench for the line fitting and a 1" socket for the main fitting. You may need a magnet to pull the valve body or the spring may push it out some. Remove the spring also, it should be 2 to 2 1/2 inches long. I think the screen on the valve body was 11mm. I put mine into a vise, put the box end wrench on it, then hit the wrench with a hammer a bunch of times. Even when it breaks loose it is very tight. There is a little ball bearing in there so be alert when the screen is removed.
Will I lose some ps fluid?
About a pint. While I had the stuff out I sprayed the inside of the reservoir and the hole where the fittings are with brake cleaner, then flushed it with new steering fluid.
Thanks,