When I had an issue with my F112, JL Audio was quite helpful. I contacted them at [email protected]
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Call JL Audio.
They told me how to remove the back on my F-113.
Basically, after you remove all the back panel screws you insert a slightly larger diameter and longer screw into one of the screw holes. This then will pop one of the corners out thus allowing you to pull out the rest of the back.
I can’t remember the size of the screw that I used that’s why I say call them for that info.