Pins 7, 9, and 11 in the definitive wii trimming guide for audio/video relocation is RED, GREEN, BLUE respectively. If you're doing VGA you'll need these pins connected as well as the H sync and V sync pins from the AVE.
If you're doing composite video you'll need pin 3 connected to an AV connection on the driver board as well as a ground to the ground pin below your AV connection on the board.
Hope this helps.