BUZZ-Petrobras SA: Board member may seek action against company
** Brazil state-run oil and gas producer's U.S.-listed shares down 1 pct at $14.64 premarket
** Board member says may complaint to securities regulator
** Says directors not informed of oil rights purchase plan
** Government to sell as much as 15.2 billion ($6.8 billion)barrels of offshore oil rights to the company, a securities filing revealed
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