I saw this question http://superuser.com/questions/694349/how-do-i-repair-the-corrupted-files-found-by-sfc-scannow-windows-resource-pro, but it was for Windows 7. 

>Windows Resource Protection found corrupt files but was unable to fix some
of them. Details are included in the CBS.Log windir\Logs\CBS\CBS.log. For
example C:\Windows\Logs\CBS\CBS.log. Note that logging is currently not
supported in offline servicing scenarios.

I ran `chkdsk` and it found no problems.