's Mercedes team have taken part in a secret test as they scramble to return to the front of the Formula One pack.Hamilton has been cast a distant 68 points adrift of championship leader ahead of the sixth round of the season in Spain on Sunday.Mercedes are expected to bring a number of new parts to 's Circuit de Catalunya in the hope of combating their 'porpoising' woes which have all but put an end to Hamilton's bid for a record eighth title.
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