Wall Oven Microwave Combination If The Microwave On A Double Wall Oven Breaks, Is Oven Fixable Or Replaceable?

If the microwave on a double wall oven breaks, is oven fixable or replaceable? - wall oven microwave combination

I want a double wall oven combination oven with oven, microwave oven and the second buy, but what happens if the microwave breaks? Can a microwave oven is in the double oven unit, or all of the double oven unit is marketed replaced to a microwave oven to get to work again? Thank you.