The pins on the unit are really a one time deal.
If you pull with the door open from the inside lip, evenly, you might free it. The unit needs to be installed evenly all around. You will hear a click when the pins lock. I bet the top pin is not locked. You need an allen wrench to hold the inside locking nut while pushing on the unit. There is trick to installing it. The direction will help you understand what has to be done.
I WILL TRY.. to post the instruction as by GM somewhere in the forum....I will try..
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