LIVE: Urgent Repairs Underway at the International Space Station

Spacewalking astronauts are making urgent repairs at the International Space Station. 

Commander Peggy Whitson and Jack Fischer went out this morning, three days after a critical relay box abruptly stopped working. Even though a second unit managed the data load just fine, NASA scrambled to put together a spacewalk in order to restore backup capability. 

The system is vital for operating the station's solar panels, radiators and robotic equipment.

The failed data-relay box was just installed in March.

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