I don't recall removing one of these recently. I believe it's a
simple matter of removing the attaching screws-- don't forget the one
in the handle bezel or the ones potentially under trim covers-- and
then pulling out on the bottom of the panel to detach from the door.
Lifting the whole panel upward once detached should lift it off the
window sill. Typically, so few of the fasteners break that you won't
need replacements to solidly reattach the panel. If necessary, you
should be able to obtain replacement pins.
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