I have a 2012 Ford Edge that seems to be plagued with problems. The latest is that I can't get the rear passenger door to open from the inside or outside. When the power locks are switched, it doesn't appear that the manual button comes up all the way. I'm thinking there may be a problem there. The button is moving, but not all the way up and down. Can anyone tell me the best way to get inside the door and what to check for?