The FIA is looking into what happened in Graz, Austria, between the final Bahrain test and the season opening Australian grand prix.
A whistleblower last week circulated letters to the governing body and some rival teams about an alleged illegal six-day test on Austrian automotive company AVL's 'rolling road' facility.
Red Bull have denied conducting the test, but it is believed sister team Toro Rosso was indeed in Graz, along with Red Bull development driver Antonio Felix da Costa.
Engine supplier Renault's Remi Taffin is quoted by APA news agency: "We just had to work with our partner AVL, because our own facilities were at full capacity."
The French marque argues that the...
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