As I recall, there is a cylinder release under the cover which is on
the edge of the door. You put a key in the lock (I believe it is
always the outside even if it's two cylinders), remove the plate,
loosen the screw and then the cylinder will unscrew.
I haven't done this in a long time, but that's what I recall.
Most commonly on Baldwin, The two screws that hold the lock together are hidden
underneath the interior faceplate. That faceplate needs to be picked off with
a small flat blade screwdriver or such, and then underneath that you will see
the two screws.
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