So, with that command you have a few options:
salvagerepository, verifyrepository (What you did) and resetrepository. You can try each in turn to see if that detects or fixes the issue first. Resetting will as you guess, reset the repository back to default.
Winmgmt is the WMI service within the SVCHOST process running under the &\#0034;LocalSystem&\#0034; account.
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