Car stopped. Key locked in ignition and car would not go out of park. Pulled negative connection from battery terminal; car starts but still locked in park with key stuck in ignition. Towed to GM dealearship. Diagnosis is to replace BTSI and ECM (both were found open). $1,131.98 to repair. I Would like to know where these two parts are located and is it labor intensive? Could I do this myself? I have many tools and I am somewhat electrically and mechanically inclined. I don't have that kind of money for repairs and I have a 4 day weekend to dig into the car if I decide to have it towed back to my house. Thanks in advance for any and all information.