I have a 2001 Toyota Camry LE with power locks. I am unable to use the key to lock/unlock the passenger-side front door. When I put the key in the door I am able to get roughly an 1/8th inch movement of the key. The power lock button on both front doors does lock/unlock all 4 doors though. I have removed the door panel on said door and don't see anything obvious that would be the source of the problem although it is difficult to see inside the door. Any thoughts or suggestions on what to look at and how to repair this?