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This web site mentions in the article Ford TSB 06-17-1, which it says is a Ford version of an International TSB for Reconditioning Turbocharger that is rusty/sticking. This article is complete with technical instructions and pictures.
It seems to address a prevalent issue (if you study the forum) with '05-'06 6.0L engines.
However, I have yet to find this TSB mentioned in the FTE database or any other.
They replaced mine as per the above mentioned TSB. Mine had lot rot whereas it sat on a small time dealers lot in the middle of Iowa for some time. Seems the farmers weren't interested in a decked out Lariat and they didn't sell it for nearly a year. Anyway the sitting resulted in the sticking turbo.