Art. 2006 Court where action brought

If you want to cancel or void a judgment, you have to file your case in the same trial court that originally issued it. This is true even if the judgment was later reviewed and upheld by an appeals court, or if the appeals court itself made changes to the judgment.

In other words, the appeals court's involvement doesn't change where you need to go to challenge the judgment. You always start back at the trial court level, since that's where the case first began.