I don't think acquiring a new server is viable. The existing server is only about a year old. I have downloaded a trial version of 2016 Server Essentials, ISO. Am I overlooking something as to how to extract from the ISO file what I need as the source for the DISM process? Here's the error when running DISM:
C:\Windows\system32>DISM /Online /Cleanup-Image /RestoreHealth
Deployment Image Servicing and Management tool
Version: 10.0.14393.3750
Image Version: 10.0.14393.3241
[===========================97.5%======================== ]
Error: 0x800f081f
The source files could not be found.
Use the "Source" option to specify the location of the files that are required to restore the feature. For more information on specifying a source location, see http://go.microsoft.com/fwlink/?LinkId=243077.
The DISM log file can be found at C:\Windows\Logs\DISM\dism.log