I did a little research as to how to repair the door hinges on my driver side bird. However, most people stated it was the upper that usually went bad. On mine, it seems to be the lower. Is there any way to tell which one is actually bad, and how to tell if JUST the bushing needs to be replaced or if it has worn beyond that and I need a new hinge? Or do you have to tear it all apart and figure that out.