Please tell us more about the situation. Is it locked and you can't unlock it? Is it jammed? Is the release moving but doesn't seem to be connected to the machanism? Probably you'll have to get inside the rear compartment and remove the interior trim to get at the mechanism. Here's a directory link for you: http://repairpal.com/directory?address=91746&car_brand_names=Mazda
Im having the same problem but with my passenger front right door, It seems to not be the locking mechanism, but the latch that is on the fram of the door, i took my door panel apart and latching device loose but cant release the door.