by the United States government, United States Code — Title 17, Chapter 1…
“ Definitions.— For purposes of this section— (1) the "maintenance" of a machine is the servicing of the machine in order to make it work in accordance with its original specifications and any changes to those specifications authorized for that machine; and (2) the "repair" of a machine is the restoring of the machine to the state of working in accordance with its original specifications and any changes to those specifications authorized for that machine. ”
