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Exxon spokeswoman Charlotte Huffaker declined to discuss operations at the Beaumont refinery, but said it continues to meet its contractual commitments.
The 65,000 bpd hydrocracker was knocked out of production on Saturday by a malfunction, the sources said.
The 110,000 bpd crude distillation unit, the smaller of the two, remains shut at the refinery following a Nov. 28 fire. Sources have said the unit may be shut for repairs until late January.