Mercedes needs to rectify niggling reliability setbacks and avoid being "saved" by mechanics after Lewis Hamilton's Formula 1 engine and gearbox was removed ahead of French Grand Prix qualifying.
Hamilton's car required a precautionary sensor change before qualifying but its location gave Mercedes a significant job to complete before qualifying began.
The Mercedes control electronics and energy store in George Russell's Williams was also changed ahead of qualifying, following the previous race in Canada where both works Mercedes suffered minor setbacks and the customer Racing Point of Lance Stroll had a fiery failure.
Asked by Motorsport .com if these pointed to reliability concerns or were coincidental individual problems, team boss Toto Wolff said: "It's individual things happening, and they're not all related to the power unit. They were power unit and chassis."
"Today [Saturday] we had a sensor issue. That was unfortunate because we needed to take the whole engine and gearbox off the car, and then disassemble these little switches."
"You can quickly have a finger problem there, and then you carry a problem into qualifying or the race. This is why the mechanics in the garage have been really diligent."
"They have, on a few occasions now, saved us. And it's something we need to get on top of, that we avoid these issues."
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