Broken Anderson sliding door lock

A quick learner from Wv says:
Hi! Our Anderson sliding door latch lock has broken and Keeps popping open. How do I know which parts to purchase to replace?
Thank you!
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Casey from SWISCO responded:

Hello,

It sounds like you're looking for our 82-043 Andersen Tribeca Thumb Latch. A broken thumb latch could also be caused by a broken mortise lock like the 82-037 . If you remove the thumb latch, you can test the mortise with a flathead screwdriver and determine if the hook engages the way that it should. Thank you!

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