Red Bull are poised to take measures to ensure Sebastian Vettel's bid for a third consecutive Formula One world championship is not wrecked by unreliability in Sunday's title showdown in Sao Paulo.
Although Vettel extended his lead over rival Fernando Alonso to 13 points following a second-place finish in the United States Grand Prix, team-mate Mark Webber retired with an alternator failure.
As Vettel was forced out of both the European and Italian races with the same issue - the former when leading - there is now real concern within the team he could be pipped at the post by Alonso in Brazil due to another alternator issue, and team principal Christian Horner said: "It's just a worry, full stop."
Engine suppliers Renault recently developed a new specification of the device that was run successfully in Austin by two of their other customers, Lotus and Caterham.
Red Bull, however, opted for the older-spec model, a case of better the devil you know, only to suffer with Webber retiring.