回複：多謝desertstorm！我對美墨邊境不熟悉，請問我應去那個邊境口岸（port of entery)去辦理？

Go to Tijuana. Park on the last exit of US and walk across border. No need to make appointment and no line up required. Just walk in an ask for TN renewal. At least that is what I did a couple of years ago.