Ferrari must fix gearbox weakness, says Vettel

By Alan Baldwin SILVERSTONE, England (Reuters) - Ferrari's gearboxes have become a weakness that the Formula One team has to fix, Sebastian Vettel said on Saturday after two failures at the British Grand Prix brought him a second successive grid penalty. The four-times world champion had gearbox problems on Friday and again on Saturday at Silverstone. The issue we had yesterday and today is something new and we need to fix it." Vettel has had a torrid time of late, retiring from the Austrian Gra