Primary DC and Secondary Backup DC launched at same time 2 years ago with same Windows Server 2019 (1809) iso running Active Directory for all. Primary still updating successfully but Backup started failing with cumulative updates 12 months ago. SFC /scannow ends at 77%. DISM /online /cleanup-image /restorehealth ends at 92.5% unable to find sources - same result when redirecting to original installation iso. Need to keep DC's in sync so please help?
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