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I have run into this before, the lock rod linkage that runs from the key release to the trunk latch become disengaged and jams the latch. The only way to get into this and resolve the issue is to bend down the upper corner of a seat back in order to gain access for your arm into the trunk to fold down the seats before unbolting the trunk latch and reconnecting the latch arms, this is a very difficult one to get into.