Hi: The upper oven, upper heating element broke, split. I'd like to replace it. It is attached by two screws in the rear of the oven. Can it be unscrewed from inside the oven? Where to purchase it, and is there a model number? In addition, we need the clips holding the element up? Several monthe ago, we replaced the front display, so is sthere a part number for that? And purchase rom GE or otherwise? Thanks, tom