Garrett does the engine mod. They are the only ones I know of with the STC. And that is Garrett in LAX. The door mod, I believe there are three different STC's. I believe AVcon has one and the factory has another. I can't remember who has the third.
Garrett Springfield,IL also does the engine work. The bigger question is.......why in the world would you want to spend the money for 731 conversion and then make it a freighter?
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