New here, hopefully you guys can help! I have a 2003 Chevy Blazer 4wd automatic, ZR2. I am including a video. About 99% of the time, it won't shift out of park, unless I push out on this little white piece (as shown in video). If I push out that piece while stepping on the brake, I can shift out no problems and drive on like normal. It doesn't happen shifting from reverse to drive, or drive to neutral. Only once I put it into park. So, couple questions. 1. What is the problem/part? 2. Is it easy to do yourself? 3. If the above answer is "yes", anyone have any how-to videos? Thanks!