I bought my Phantom 1.1.1 a month ago used from b&h photo online. It worked fine, i did crash it a few times but everything still worked. One of my arms was slightly bent in a crash (gps still worked) so i decided to do a shell swap. Since then I have not been able to get a gps signal. 1 green, 3 red lights constantly. All of the cables are plugged in and i have recalibrated a few times. The only thing i could think of would be a cracked antenna on the gps. But i dont know how it would have broken during the swap, i was very careful. Also, i cant check the antenna because one of the screws is slightly stripped. Any suggestions on fixing the gps and/or how to remove such a small stripped screw to check the antenna? Thanks guys!