Hey guys, I've owned my Fiesta ST for a little over a year now. Never carried passengers in the rear until the other day, and found out I have a problem. The rear passenger door on the driver's side opens fine from the outside, but won't open at all from the inside, i.e., the passenger sitting in the rear seat behind the driver is locked in, and I have to open the door from the outside to let them out. Tried the door lock/unlock button on the dash and that doesn't work. It clicks and all the other doors lock/unlock but not the driver's side rear passenger. Anyone have this issue or might know what could be the cause? Also, is this something covered under warranty?