There's a lot of screws in there, but if you did get the correct ones (I think there is just two) the belly light assembly should tilt out from the top of the assembly (glass, chrome frame and all the backing plate). It could be slightly glued in there from drinks being spilled in the machine. If it seems to be in there quite rigid, make sure you removed the proper screws. You will also need to unplug the wire harnesses that go to the light assembly. Most likely the bulbs are bad, but make sure the starter is good also.