Early day-one exit for McLaren after power unit issue

McLaren have been forced to abandon running on the first day of the second pre-season test in Spain because of a faulty seal on the MGU-K part of Honda's new power unit. The problem, which necessitates a full replacement of the power unit, occurred midway through the morning session after Jenson Button had completed 21 laps and run as high as second quickest in the MP4-30

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