I'm not sure about Turbonetics, but you can't rebuild Garrett ball bearing turbos. You replace the entire CHRA. Ball bearing turbos are made to last forever unless you get contaminates in the oil, starve them of oil, etc.
1992 Eagle Talon TSi - sold (POS)
2002 Mustang GT - sold
2002 SVTF - sold
2008.5 Mazdaspeed3 GT - cursed
2003 350Z Track - basically stock, and it runs