Factory Turbo rebuilding?…..

They’re pretty easy to rebuild. If (and that’s a big IF) there is a quality rebuild kit available for your model. Usually oversized (OD dimension) bushings are available for the center section and the thrust is just replaced, along with a few snap rings. The only two critical machine shop operations are boring the housing and balance. You’ll have to find someone reputable in your area to do it. I wouldn’t trust sending out the parts. Look for diesel injection shops.