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ISS managers are meeting to make a plan to deal with the failure on Saturday of the #1 data relay electronics box on the S0 truss of the station.
The unit, called an MDM, has an identical backup in place so no station operations have so far been effected. However, that backup had failed back in 2014 and required a spacewalk to replace it, so it is not clear to me as yet whether the station has any additional spares available to replace the newly failed unit. If so, it will still require a spacewalk to make the switch.
If there is no spare, they will likely have to ship one up on the next cargo flight, as the MDM is essential for operating the solar panels and radiators as well as the robot arms.