At my request
kiwidude added a "Save Log" to the new "in Another Library" feature in the Find Duplicates plugin
Seeing how quickly (and presumably how easily),
kiwidude implemented my request, I am hoping a similar "Save Log" option can be provided for the "Check Library - Problems Found" dialog.
I appreciate I can copy it to the clipboard, open a text editor, paste the clipboard and save the file, or shock horror - print it, but ...
It's my experience that I can't fix many of the problems, without first looking at the books in question within Calibre* and/or at the relevant folders in Windows Explorer. Only then can I decide on the what action is needed to effect a remedy, either via Calibre or via the file system.
* the dialogue box window is modal and one can only run a single instance of Calibre, hence one has to close the dialogue box window to use the main Calibre window.