One, If you are signed in, click on the research tab and then on stocks. Fill MARA in the blank on the left and you pull up the "snapshot." Click on "news and events" on the left side and the erroneous downgrade from Thompson Reuters appears as the top item on the list (as of 6:09 pm).
Clicking on that news link pulls up another page where, as it happens, they have no further information.
I share your outrage, but it will have no effect over the term I intend to hold the stock. Talking with Fidelity now