By Marianna Parraga HOUSTON (Reuters) -Toronto-listed Gold Reserve said on Friday it has filed motions to disqualify a court officer and the judge overseeing an auction of shares in the parent of Venezuela-owned Citgo Petroleum, as well as two firms advising the Delaware court. The miner has been trying to prevent the court from declaring a $5.9 billion bid by rival Amber Energy, an affiliate of hedge fund Elliott Investment Management, as the auction's winner since its own $7.9 billion bid was not recommended in August. Gold Reserve is one of 15 creditors lining up to cash proceeds from the auction of shares in PDV Holding, a unit of Venezuelan state oil company PDVSA, as compensation for debt defaults and expropriations in Venezuela. GOLD RESERVE ALLEGES CONFLICTS OF INTEREST Gold Reserv

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