The inner trim panel has three screws along the very bottom edge - you have to get down very low to see them. To remove the panel the grab handle needs to be taken off first HOWEVER...
The door lock cylinder may be removed without having to remove the door panel... My book says...
13.3 Open the door then remove the plastic cap in the rear edge of the door to locate the retaining screw.
13.4 Pull the door handle out, hold it in this position whilst undoing the retaining screw until it comes to its stop. Do not remove the screw too far or the locking ring may fall into the door.
13.5 Pull the lock cylinder housing out of the door handle and release the handle to the original position. Do not drop the the locking ring into the door as it will be necessary to remove the inner trim panel to recover it.
Peccavi, October 2008