FIA have e-mailed a press release on their investigation of the 2019 Ferrari engine. There were suspicions and runours about the Ferrari engine legality last year, mainly because of a sudden increase in performance. FIA sent the e-mail late on Friday after testing so that no on was available to answer questions and no details have been provided of the investigation. I don't think this one will be buried that easily.
https://www.youtube.com/watch?v=U0b7a9R3qSQ
https://www.youtube.com/watch?v=U0b7a9R3qSQ