Where is the Airport Modul?

It behind the black clutch cover on the bottom of LCD lid. Check out how to replace the LCD panel. But you should first check the connector wire. Its that long sliver connector wire right under the fan. unplug it, clean contacts good and re-plug that should do the trick, but if doesn't then follow the LCD panel replacement. Just so you won't get confuse the bluetooth and the airport are connected together in that order from left to right. By the way you don't have to remove the glass to get access to the airport. Hope that helps. By the way if you don't have the correct tools, just go to home-depot and by a husky 9 piece set of screwdriver and another of torex driver.

Hope that helps.