Ken,

you'll have to slowly and carefully pry the clear lens away from the housing. Pry at all 4 corners in sequence straight out. Do not tilt or tip as it is a bit brittle.

Once removed, I suggest instead of tweezing the bulbs out, remove the housing from the roof by taking out the 2 Phillips-head screws. The bulbs sit in little removable holders of their own.
If you push on them from below, they are easily damaged.

Cheers.