Way to tell if CSC has been changed?

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Two things. First, if the CSC was replaced with the stock OEM unit, you will still have a "ticking time bomb". As you've already gathered, the stock units are prone to failure. Second, if the CSC was replaced with the Z Speed HD CSC, it should be obvious from an inspection of the clutch lines running out of the transmission housing. Go to the Z Speed website, and look at the photo of the HD CSC and clutch lines. The lines are braided stainless-steel and distinct from the factory lines and set-up. Even the bleeder valve is different. Then take a look at the lines running from your housing, and you should know right away if you're running with the stock CSC or the HD CSC. Z1 has a CSC replacement unit that could have been installed (?), but it is an entirely different set-up than the stock CSC. It would be obvious through a quick inspection if the Z1 unit was installed. Again, if in doubt simply take a look at the photo posted in the Z1 website and compare. Trust this helps.