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Marathon spokesperson Jamal Kheiry declined to comment.
The 64,000-bpd RHU and 60,000-bpd RHU have been shut since a Feb. 4 power outage at the refinery.
All other units at the refinery have restarted, but with the RHUs shut, the refinery is operating at about 80% of its capacity, the sources said.
RHUs use hydrogen to remove sulfur from motor fuel feedstocks in compliance with U.S. environmental rules.
