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Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
Everything you mentioned you have checked or replaced were going to be the same thing I was going to say to check until I read all of your post. I normally find this situation to be the steering gear but you addressed that and more. The only think I can think to add would be to perform a power steering pressure and flow test to make sure there is not a concern there effecting the recirculating ball system in the steering gear.
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Hello again Chris here,