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You need to disassemble the cover behind the door handle on the inside, you will then get access to the linkage and be able to operate it with your fingers. Once you get it open i will advise you to disassemble the whole linkage and lock, clean it, lube it, and put it back. You will then be good for another ten years or so.

After much research on the internet, I didn't really find anything besides this thread to give me an indication of why my liftgate didn't open anymore and how to fix it.
My problem seemed to be the same as Chuck39. I could hear the lock unlocking but I couldn't open it from outside or inside. After pulling the handle housing and reaching in there to unlock the liftgate, I pulled the bottom plastic trim and here is a short video to show what the problem was:
The problem was that the black plastic pin wouldn't engage behind the rocking plate so all I did was loosen up the three bolts for the liftgate latch handle and pushed it as far out (in the direction of the red arrow) as I could so that the rocking plate would travel the add'l distance to allow the black pin to catch behind it.
View attachment 1168218
Mine wouldn't open, the lock mechanism has been poorly designed and has a plastic sliding piece which takes all of the pressure to open the lock. Mine broke and I glued it and it lasted another year, then broke again so I manufactured a steel one up. The piece I am talking about is part of the unlatch mechanism and is not available as a spare part. (replace whole lock mechanism)
When it happened, I realized if you push the top gate in, and while holding it in, operate the latch handle and you may be able to open it, I did this in one hand action and it worked until I pulled it apart. Basically by doing this you are taking load off the catch so it will release easier. The problem however may be the little broken piece of plastic.
Not much response here H? I suppose @100 TD isn't active anymore. Can't help you much with your quest, but it will be interesting to see if a printed part would work, and hold up. Sub'd.