Mercedes have identified the cause of Valtteri Bottas' Spanish Grand Prix retirement, which they say was caused by a new failure they've not witnessed before during a race or during testing. Bottas was third when he retired from the race, won by team-mate Lewis Hamilton, and it was suspected that his 'old' power unit may have been the cause. The Finn was forced to revert back to 'PU1' for the event after a water leak was found on his new unit ahead of qualifying. PU1 had already completed the opening four races of the season, and whilst it wasn't near its mileage limit, Bottas, like Hamilton, was scheduled to race with an upgraded unit in Spain. However the...
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