Hello,
This is a very interesting mission and I would be glad to help you achieve your goal with this letter to your boss. From my experience as a team manager in a big and politic corporation (Walt Disney), I have developed very high skills of written communication. Such sensitive topics require diplomacy, honesty, fairness and the ability to see the problems from different perspectives.
I you are willing to work with me, we will need to meet through skype so you can give me a detailed report on the situation. I would also lead this interview with questions so I get a deep understanding of the situation. Then we can discuss what you would like to achieve with this letter and I can give you my perspective as a team manager.
Thank you
Xavier Valmorin