I'm making a postscript of a bunch of C code, and enscript reports I have 2 non-printable chars

[ 91 pages * 1 copy ] left in a.ps
2 non-printable characters
non-printable character codes (decimal):
128 153

However I couldn't find these chars with grep

grep -r $'\231' *
grep -r $'\200' *

Is there a way to let enscript report which lines contain the non-printable chars?

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