Hmmm,
Another problem. /scannow failed again at 44%, with the "couldn't perform requested operation" msg. The new section of sfcdetails.txt looks the same as the previous run. But near the end of the cbs log, we find
2019-11-25 14:34:55, Info CSI 00002813 [SR] Beginning Verify and Repair transaction
2019-11-25 14:34:56, Error CSI 00002814 (F) c000a2a7 [Error,Facility=(system),Code=41639 (0xa2a7)] #36210529# from Windows::Rtl::SystemImplementation::DirectFileSystemProvider::SysReadFile(h = 3d8 ('\Device\HarddiskVolume5\Windows\WinSxS\amd64_microsoft-windows-n..orkconnectionbroker_31bf3856ad364e35_10.0.17134.1_none_422fdc892e0c33b3\ncbservice.dll'),
evt = 0, apcr = NULL, apcc = NULL, iosb = @0x2e40e7b490, data = {l:0 b:}, byteoffset = 0, key = (null))
[gle=0xd000a2a7]
2019-11-25 14:34:56, Error CSI 00002815@2019/11/25:19:34:56.370 (F) onecore\base\wcp\sil\ntsystem.cpp(3533): Error c000a2a7 [Error,Facility=(system),Code=41639 (0xa2a7)] originated in function Windows::Rtl::SystemImplementation::DirectFileSystemProvider::SysReadFile expression: (null)
[gle=0x80004005]
2019-11-25 14:34:56, Info CBS Added C:\windows\Logs\CBS\CBS.log to WER report.
2019-11-25 14:34:56, Info CBS Could not get active session for current session file logging [HRESULT = 0x80004003 - E_POINTER]
2019-11-25 14:34:56, Info CBS Not able to add pending.xml to Windows Error Report. [HRESULT = 0x80070002 - ERROR_FILE_NOT_FOUND]
2019-11-25 14:34:56, Info CBS Not able to add pending.xml.bad to Windows Error Report. [HRESULT = 0x80070002 - ERROR_FILE_NOT_FOUND]
2019-11-25 14:34:56, Info CBS Not able to add poqexec.log to Windows Error Report. [HRESULT = 0x80070002 - ERROR_FILE_NOT_FOUND]
2019-11-25 14:34:56, Info CBS Not able to add SCM.EVM to Windows Error Report. [HRESULT = 0x80070002 - ERROR_FILE_NOT_FOUND]
2019-11-25 14:34:57, Error CSI 00002816 (F) c000a2a7 [Error,Facility=(system),Code=41639 (0xa2a7)] #36210528# from Windows::Rtl::SystemImplementation::CFile::ReadFile(Flags = 3, Buffer = {l:0 ml:376832 b:}, Offset = 0, Disposition = 0)[gle=0xd000a2a7]
So that's 1 file not found, maybe 2?
pete