Yes, it has been published. See Inmarsat's post on their reasoning, based on AAIB data at [0] and the WIki page [1] also has a good summary. The peer reviewed paper [2] by Inmarsat is also available from the Journal of Navigation.

0. https://www.inmarsat.com/news/malaysian-government-publishes...

1. https://en.wikipedia.org/wiki/Analysis_of_Malaysia_Airlines_...

2. https://www.cambridge.org/core/journals/journal-of-navigatio...