Typically, they should just rotate and pop out. Remove the brown board as I believe the green board is mounted pretty solidly to the brown board (the green board houses an amplifier IIRC).

-By this image you can see that he left the two connected.

-You can see all three bulbs pretty easy here.
I'm not finding many pictures to show you what to do unfortunately, and it looks like some of our pictures on the article I linked have decided to stop working. Hopefully, my bit of insight helps.