Door Handle on microwave came partially off

Question

Our over the range microwave has had a problem with the door handle.  Recently the top s***w that holds the handle on came out and seems to have dropped down inside the door.  we cannot see anyway to get it out or to replace it (no visible screws or ways to get inside) , therefore our handle is just swinging loose right now.  Is there anyway we can fix this problem, or because of the dangers of working with microwaves will we have to call a professional?