Could use some help. Has anyone opened the rear/bottom cover of a Toshiba Satellite C55-A5285 laptop? Unscrewed 16 screws, worked all around the edges with a flat edge and everything is loosened... except for one spot. And I'm concerned about applying any more pressure. I even wonder if there is not some other screw or attachment that does not come out to the external cover in a manner that can be seen. Could really use some help. Need to replace the crappy WiFi card. Thanks!