Due to broken of latch of door release part, this part pops and drop off when I push it to open the door. This is Superba Selectra 27. I know the convectional oven Model #KEMS377BWH, but can not find Model # for microwave oven. I attach photos (overall, microwave oven, door release part of microwave oven and broen part). Please tell me how to purchase and replace this part.