Removal of Brisk Ceiling Cover

[slow]

I am hoping someone can provide some insights on how to remove the ceiling cover for a ducted Brisk II a/c unit. There seems to be six screws holding it in place. Four of the screws are easily accessible once the grill and filter are removed. But there must be another two screws under the round caps at the rear (top of the following picture).



How are caps removed without making a mess of them?

BTW: I want to remove the ceiling cover to access the corner bolts that secure the a/c to the roof.


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[sourdough]

They are under the caps. I just use the tip of my small pocket knife and very gently work them out. Haven't messed them up yet. Probably a better way but it has worked for me so far so didn't worry about thinking of something else.