I had that problem with my p11 and i just unscrewed the screws in the handle and poped off the door. Its easy, though a little daunting at first. I also wraped and taped small strips of foam around those rods and anything that i could find that rattled, while banging the door with your hand. This found most of them, and worked really well in my boot/trunk as well, but cannot compare with a good sound deadening of the inner and outer skins on the doors.
Hope this helps.