Found this thread helpful today when I had this problem. Thought I'd share a slight addition in case it helps someone else.
I used a pry bar to lever the seat up to gain access to the front grab rail bolt. All other steps to get the tail unit off is straight forward or said already in the links above.
My latch mechanism had 'failed' due to the outer sleeve popping out of its 'stay' on the frame. See circled picture. A slight press with the g clamp on that 'stay' or clip meant it now holds that cable much more securely.
It was likely knocked when it was removed or possibly some material lost when frame was sand blasted and powder coated.
Sent from my iPhone using Tapatalk