Red Bull have been forced to make a second design modification to their car in just over a week following the latest investigation by the FIA.
Last Friday a technical directive was issued which forced Red Bull to remove holes from the floor of their cars directly in front of the rear wheels as they contravened the regulations.
Now Christian Horner's team have been caught a second time by FIA technical delegate Charlie Whiting with regard to the wheel hubs.
Red Bull claimed that holes in the central area of the hub were for cooling, specifically to channel away hot air.
The FIA, though, feel they also assist aerodynamic performance, and so for this weekend's Canadian Grand Prix the team have had to block the holes.
Understandably, Red Bull are playing down the significance of the change, claiming there was no significant advantage gained.