Replacing Broken Lock on Pella 450 Series

A home owner from Geln Burnie / Millersville area says:
I have a broken lock on my sliding door and have received a new one, but I cannot find a way to get the old lock out and new lock in. I removed the handles, no problem, but cannot seem to find a way to remove the old lock. Please advise.
User submitted photos of patio door hardware.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
I'm not sure. It's hard to tell based on your photos. I recommend seeing if there is a snap on cover on the handle which hides the mounting screws. That is the case for many Pella door products that screw on.
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