Lost recognition of system

Core Machine (Operating system/System info/Roon build number)

Set up consists of Innuos Zenith Mk3, connected to PrimaLuna Evo100 dac, in use for almost a year. The dac had a valve failure and the Roon system now shows the Sonus and Tablet as only Audio outputs, which previously had not appeared. It automatically connected to Sonus by default.
Having reconnected repaired dac, it is not being recognised as an output device now!
Have tried various things to no avail.
Any ideas to help much appreciated.
Regards, Jon.

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