Hi my name isXXXXX will try and help you with your issue.
The entire control box is held into place by plastic tabs that extend through the liner
So there are no screws that hold it into place
Let my post a picture and that should help you, but the easiest way to drop the box down, is start in one of the corners and insert a flat screwd driver and slowly pull down on the front of the box to disengage the tabs
The picture somewhat shows those tabs, and once you have the front pulled down it slides right out, the only other thing to do is remove the plug that is inside and you can then pull the entire control box out.
Then the light cover slides out and the control is mounted in a box.
The box that holds the control is also held on by plastic tabs.
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I don't know if you can see my posts or not, sometimes the chat feature won't work for some people.
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