[Blasirl]

I would try to compress the sides using two plastic trim removal tools - you know, push them towards each other and gently lift. This is only a suggestion based on anecdotal evidence that they were installed by pushing them in. If some has access to a exploded parts view, that might answer more for you.

 

[Blasirl]

Are you looking at the buttons to release the posts? If it is internal, then you would have to hook it from the inside and pull, but I still think it is external and needs to be pushed inward - just sayin - not knowin ;>)