I have a 2005 Ford F-150 supercab. 5.4l with 4x4. My front drivers side door has stopped locking and unlocking, with both the fob and switches in the truck. Thinking it's the actuator. Door **** just kind of shutters. Wondering if anyone out there has experienced this and has any ideas on my problem. If it is the actuator, is this very difficult to fix on my own. Also if anyone has ford part numbers. Thank-you!