What's interesting is that aircraft piston engines are remanufactured that way (using swapping.) After flying 2,000 hours, you drop your engine on a palette, s

What's interesting is that aircraft piston engines are remanufactured that way (using swapping.) After flying 2,000 hours, you drop your engine on a palette, ship it back, the mfg. sends somebody else's overhauled engine back to you, and you install that one. But instead of 10 minutes, it takes over a month. Oh, and that $10k to $100k bill per engine ...