Originally Posted by BillfromWI
I've found that Airstream often screws and dowels joints in large panels. You will probably have to do damage to get it apart. Least damage might be had using a multitool and the appropriate blade to cut the dowls.
The Airstream Parts Book for you model will show how all the panels fit together but the drawings don't always show the dowels--the joinery details are vague.
I used my endoscope from lavatory furnace duct wall hole to look back there and take a look. Could only see staples and glue holding the side opposite the 3 screws I had removed. Then I removed the slide out pantry. Still, nothing learned. Then I used the screws and screwed into the panel using the existing holes where privacy curtain was attached. This allowed me to tug on panel. Doing that, the whole pantry moved. After all of this, I think the board is integral with pantry wall and actually contributes to holding that assembly in place. I did look at the parts book and as you said it was vague.