Does a good faith violation have any consequence beyond 12 months after it happened?

The consequence of 3 good faith violations in 12 months is a 90 day account restriction.

Once you serve your time (account restricted for 90 days), I don't know if the 3 violations are wiped clean or whether the rolling count continues. I would guess the latter in that when you incur a 4th violation, there's a 12 month look back and if it sees two previous violations, you're in back in trading hell again. Google for details.