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This may or may not help, but after getting off the phone with a SONY rep I was told: If you've already updated to 3.56 and currently have PSN access, you're safe. If you haven't, you're most likely getting the banhammer. So don't bother updating period, if you haven't already.
So, if you did update from CFW to 3.56 and were worried that you were still risking a ban, this should put you at ease.
Now, there's a slight chance that this dude was bluffing out of his ass, but he seemed legit enough.