You may want to look at this:
https://cccforum.discoursehosting.net/t/power-steering-pump-froze-tonight/9506/4
You may also want to read the link in that tread.
That hapened to me in 2018, I rebuilt the control valve this winter (Dec. 2019 - with kit from CJ Poney parts) and will see this summer if that worked.
Testing on jack stands was OK i.e. no problem full right and left turns with steering wheel pushed and maintained to the max.
I also hope for less play in the steering wheel, which also looks promising based on testing on jack stands…