Porsche 911 Carrera Owner's Manual page 217

4. Check whether the lock of the windstop lower
section is engaged. Press lock together if
necessary (arrows).
A - Lock open
B - Lock closed
5. Check whether the two red locking handles
are in position A (open). Open the lock if
necessary. To do this, push the locking
handles inward as far as they will go and swivel
to the side (arrow).
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Mobile Roofs