i was looking for a photo of that bulb cover on line but its hard to see one, the cover might not come off , but the hole thing might just pop out frame and cover in one,, and then you take the bulb out from the back, try get a screwdriver , and prise out the bulb frame a bit at a time, thats how mine works , but its not the same model as yours , you can go to Utube, and type in diplomat oven " and you wil see videos on the there , and ask there, he will tell you there ,,
mi, October 2011