It seems that RBR failed an unofficial test on Friday... And were making modifications on Friday night, it surely must have affected them.
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... it has emerged that, prior to the official tests, Red Bull and McLaren, who both admitted to making modifications before traveling to Monza, asked to use the FIA's new testing equipment and methods in the scrutineering bays.
McLaren's MP4-25 passed,
but Red Bull's car failed by a small margin, according to the BBC.
The team reportedly made overnight modifications, and after Mark Webber qualified fourth on Sunday, the RB6 was re-tested and officially passed the new tests.
http://www.f1sa.com/index.php?option...:f1&Itemid=157
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