I've seen this suspension advisory on various LS430's, I even had it on my first one but never had anything done about it. On lots of cars the steering rack inner joint is replaceable but I don't know about the LS, hopefully someone will enlighten you. If you get a chance to test drive it make sure it doesn't pull badly to the left, I'm not sure what causes it but it's not too uncommon. And I believe you can buy just the lower bush.