engine air-oil separator (AOS) replacement cost?

[78F350]

I've replaced a couple. There's a rubber hose on the bottom that can be difficult to clamp in place, but it's not '$1,000 difficult'. The only other factor I can think of is that some of the more rigid plastic hoses that attach to it may be brittle and need replacement too. That may justify the $400, but not $1,000.

Here's the article on how to do it yourself: https://www.pelicanparts.com/techarticles/Boxster_Tech/09-ENGINE-Air_Oil_Separator/09-ENGINE-Air_Oil_Separator.htm