How do you remove the AC cover on the ceiling?

[RKassl]

After bouncing around for 8960 miles in Alaska I wanted to check the bolts on the AC. I took off the filter cover, but what does it take to remove the plastic cover to expose the four mounting bolts?

Thanks

[H. John Kohl]

There should be little 1" circles that pop out covering the inside ceiling cover. Hope this helps and safe travels.