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The ARRL Letter reports that the unit was packed aboard a SpaceX-16 Dragon supply ship last December and returned to the surface in mid-January.
ARISS and the transmitter's manufacturer, Kayser-Italia, will try to figure out what went wrong and whether the unit can be repaired or will need to be replaced. The whole process, including all pre-launch certifications for a new or repaired transmitter, is expected to take at least a year.