Hey ,sorry it took me so long to find this...
on the door lock , first you need to remove the door panel , there are 2 screwes behind the door grab strap covers there ...get those out ...then pull the cover off the door opening handle and lock area...there seems like there is ascrew there if i remeber right ....
at this point make sure the window is down once you get the panel off (there are several little plastic clips that hold it on) then remove the three bolts that hold the door latch to the door (i think these needed torx bits ) then carefully remove the metal locks rods from the latch then pull the plugs off the latch and get it out of the car set it on a workbench and looks for the part i posted a pic of in the threaed below:
http://www.cadillacforums.com/forums...ight=door+lock (Door lock actuator) 
mark how that little cup is installed
supergule the split in that part , be sure when reintalling that little rubber cup that you put it in backawards of how it was in there...yes i said put it in backwards ...trust me ....
once you do that she will be good for another 10 years ...