replace wifi-Board on MacBook-pro retina

I don't see a guide published for this yet but it's pretty easy to get to. If you refer to the 13" Retina Teardown it is shown in the 10th step.

The teardown does a bit more than you need to do in order to remove/replace the wireless card, however it does have good visuals for showing you locations of components.

To remove/replace the wireless card:

1 - Remove bottom case by removing the 10 screws

2 - Disconnect the battery (see step 6 in the teardown)

3 - Remove wireless card (see step 10 in the teardown) by disconnecting the attached antenna cables, unscrewing 1 x T5 screw and gently pulling out

Reverse for reinstallation

Hope that helps!