Replacing Over the Oven Microwave

Winnebago mounts them a number of ways but in general they are easy to remove. I had to remove the wood trim and as I recall two screws on the sides and a steel bracket that screwed to a steel plate in the ceiling.
I would call customer service and ask them about yours. If you have your VIN they can cross that to your Winnebago unit ID and maybe give you a better answer.