Mercedes have revealed the exact reason for Nico Rosberg's Singapore Grand Prix retirement after analysing his steering column and electronics back at their Brackley base. The German was forced to start from the pit lane and then later retired during his first pit stop as he had no control over the cars clutch and couldn't change engine settings. Mercedes say a 'foreign substance' had contaminated the steering column and caused a short circuit in the electronics. It's believed the 'foreign substance' is used during pre-event procedures but went undetected until the race start. "Forensic analysis has revealed that the steering column electronic circuits were contaminated with a foreign...
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