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The left rear door on my 2001 Park Avenue would not unlock and open, despite trying the drivers door lock switch and the lock knob located next to the inside door handle. Someone (maybe here) suggested lubricating the door latch mechanism to free things up. I had to remove the lower part of the rear seat (easy), and the back of the rear seat. Once you do that, you can remove the inside door panel and see (sort of) the latch mechanism mounted inside the door at the rear. Use PB Blaster with applicator tube and give the latch mechanism a few shots from inside the door. You should be able to unlock and open the door after the lube soaks in for a few minutes. You can use WD-40, but the lubricating properties won't last too long and you'll be going through the same exercise in a month or less.