Originally Posted by
ORAC
From what I have been able to find the fault identified concerned the Rubidium clocks, not the hydrogen masers. The fault was, apparently, caused by part of the system testing prior to launch.
Regardless, it would seem they have found a new supplier for both in future satellites. The current supplier being SpectraTime.
https://www.orolia.com/media-center/...-critical.html
SpectraTime are part of the Orolia group.