Brawn will on Saturday morning carry out tests on Rubens Barrichello's Spa-specification gearbox after an oil leak and fire at the end of the Belgian grand prix.

Brawn on Saturday morning carried out tests on Rubens Barrichello's Spa-specification gearbox after an oil leak and fire at the end of the Belgian grand prix.

The team has confirmed that his Mercedes engine emerged unscathed from the problem, but doubts about his gearbox persist.

Barrichello is out of sequence in terms of an allowable change to his gearbox, meaning a five-place grid penalty will apply if he needs a new one fitted at Monza.

Moreover, as the Brazilian's gearbox was new at Spa, it must also be used at the forthcoming Singapore and Japanese grands prix.

The team has been permitted to break an FIA seal and make a small repair, "but we are still not sure whether we are going to have to change it or not", Ross Brawn told Germany's Auto Motor und Sport.

Brawn tested Barrichello's gearbox in practice