My kid's car now has the disintegrating diverter door foam syndrome in the heating system, resulting in a large piece of foam stuck behind the center vent outlet, above the heater control. I can't for the life of me figure out how to pull this outlet out in order to pick out the foam parts. Is it secured by spring clips or detents at the sides? Or screws? The OEM book is not too informative, unless I missed the correct section.