probably online some where. i'm sure one of our sponsors like ecs has some. involves taking off the door panels. shouldn't be to bad

The removal of the actuator can be viewed here. It was compiled with pics. http://www.xoutpost.com/bmw-sav-foru...-fix-pics.html
You can then consider if it is a DIY. I did removed the actuator on mine and it was doable but not as easy as the pics depict. Just be careful with all the screws and the clips on the panel and of course the air bag. The clips do break. I have purchase some new ones. Not expensive though.
I hope this helps. Cheers.

This happened to me a year ago. Same behavior. Definitely actuator.

Took it to local independent for $300. Dealer wanted $700.

not manually. the key clicker for locking all doors works, and I'll either lock them with the clicker, or put the key in the door and double turn to lock all doors. It's only the unlock that doesn't work on the front passenger unlock.