Red Bull's nightmare continued on the final day of the first pre-season test in Jerez on Friday, despite efforts to temporarily overcome the issues they've been experiencing. The championship-defending outfit completed just seven laps before they called it a day, half-way through Friday's running. That brings their total tally to just 21 laps - whilst main rival Mercedes completed 309 relatively trouble free. Whilst some of the problem lies with power unit supplier Renault, the main cause is that of overheating as a result of the way Red Bull has packaged the unit. As a result - and in the hope of getting some decent mileage under their belt - they cut openings in the bodywork to increase...
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