How to replace a defective Pella latch lock?

A quick learner from kent, ohio says:
I have removed all local screws. Are the screws at the top and bottom of the door to be removed as well
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Casey from SWISCO responded:
Good morning! Thanks for posting. There shouldn't be any screws at the top or bottom of the door that you need to remove. Take a look at our handy guide on how to replace our 40-191 and see if it helps.
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