Those actuators are very fragile... just replaced the ones in my RR door and RL door on my 2005. They all failed this year. On my 2003, two of them broke... 285$ a piece, it's not something cheap.
Your best option, remove the door panel and all the parts to reach the actuator and go to a Ford dealer. Will take 30 min and will be donne for 40-60$ of time. *+new piece*
It sucks but, I don't want to put a used one that will fail the year after.
2012 White Mitsubishi Lancer 2.0L : New car
2005 Black Ford Focus zx5 SES : Trade In
2003 Arizonna beige Ford Focus SE : Sold