Unfortunate as it may be, sometimes in large corporations, it takes paying an outsider to identify and document something, before anything will be done about it.
That's not what it takes: it's what they prefer to be done by the kinds of people who won't disrupt them too much with reforms. There's been many internal assessments in companies that did even better. Usually just have to survey and interview the workers to see what's going on. The supervisors and managers, too, but the big problems usually start from them on up.