Thermador wcggcv30 gas cooktop - how to remove...

Question

I've removed the three screws from along the top perimeter of the box which I assumed were the only fasteners tying down the glass cooktop to the box. However, when I try to separate the glass top from the box, it doesn't come loose. I'm afraid to really try hard to pry it off since it's glass and it seems as though it's being held down from other points not necessarily along or near the edge. I'm need to replace a momentary switch for the fan.