You can compare needed files between freshly installed gateway and questionable gateway. Make sure the version and Take are the same. Download file to be checked (like table.def) from both gateways, use Excel or NotePad++ features to see differencies between 2 files.
Another idea can be to check when was needed file last modified. In theory, the .def file is supposed to be modified during upgrade or Jumbo installation. But it can be also modified by management by pushing the file to gateway... You can check when was needed file created, modified and last accessed using linux command "stat".
Kind regards,
Jozko Mrkvicka