Mercedes says that a foreign substance in Nico Rosberg’s steering column led to the problem that forced him to retire from the Singapore GP.
The team said via its Twitter feed: “Forensic analysis has revealed that the steering column electronic circuits were contaminated with a foreign substance.
“The contamination was not visible and did not manifest itself until Sunday as Nico went to the grid.
“The result was an intermittent short circuit in the electronic circuits meaning Nico could not command clutch or engine settings.
“Fresh parts will be used at the forthcoming races. Our hard work on reliability processes will continue at the same intensive level.”
Later Mercedes added: “To clarify, the contaminant was a substance used in normal pre-event servicing of the component,” in effect confirming that an employee had simply screwed up somewhere along the line…