'Alarm bells have rung at Mercedes after new problems'

That is what the Italian Motorsport.com reports. Toto Wolff said on Friday that he didn't know exactly what caused the problem with Bottas' gearbox. It is not clear if an explanation has been found.

It is clear that there are issues with the reliability of the new transmission. Last winter, a major update was rolled out which was supposed to help generate aerodynamic gains, but so far it has mainly resulted in stationary cars in the pit box.

The grapes are sour this year because testing is only allowed for three days. Bottas and Vettel have lost valuable track time that is not so easy to make up.