The court wants the two companies to prove that contract values to build an offshore production unit have not been artificially increased, TCU said in a statement.
Petrobras hired GDK to build the P-34 floating production, storage and offloading vessel for US$88mn. P-34 is due to produce oil and gas at the Jubarte field in the Campos basin.
TCU wants to know whether GDK artificially increased production costs by some US$14mn.
Specifically, the court wants to know why GDK billed Petrobras some US$4.8mn for specific engineering services and paid subcontractors about US$3.4mn, according to the statement.
Contract managers in Petrobras were fined 10,000 reais (nearly US$5,000) each for problems in the contracts.
TCU started probing the contracts with GDK in September 2005 after allegations surfaced from politicians and other companies.
The P-34 has capacity to produce 60,000 barrels of oil a day. First production is scheduled for September and the platform is expected to reach full capacity by year-end, a Petrobras spokesperson previously told BNamericas.
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