You could toggle Word's field code display 'on' (e.g. via Alt-F9) then use:
Find = Section ^d
However, any formatting changes would be applied to the entire 'found' expression, not just to the field code. Furthermore, the correct way to reformat the field in such cases is via the addition of a Charformat switch and applying the formatting to the first letter in the field code, thus:
{ REF Sect_Stuff \* Charformat}
(to apply bold, red, formatting - Character Styles can also be used). If you have a great many of these to do, a macro might be called for.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]