The generator matrix

 1  0  1  1  1  6  1  1  4  1  2  1  1  1  0  1  2  1  2  0  1  1  1  1  1  4  1  0  1  1  1  1  1  2  4  1  1  1  0  2  1  1
 0  1  1  6  3  1  0  3  1  2  1  5  7  6  1  0  1  5  1  1  3  5  4  6  0  1  6  1  3  2  1  7  4  1  1  5  4  6  2  2  7  3
 0  0  2  0  6  0  6  4  6  2  6  4  2  4  4  6  6  0  0  2  4  2  0  6  4  2  4  4  0  6  6  6  2  2  2  0  2  0  6  4  4  6
 0  0  0  4  0  0  0  4  4  0  0  0  0  4  4  0  4  0  4  0  4  0  0  0  0  4  0  4  4  4  0  0  4  0  4  0  4  4  4  4  0  0
 0  0  0  0  4  0  0  0  0  0  4  4  0  4  0  4  4  0  0  0  4  4  4  4  4  0  0  0  0  4  4  0  0  0  0  4  0  4  4  4  0  4
 0  0  0  0  0  4  0  0  0  4  0  4  0  0  4  0  4  4  0  4  0  0  0  4  4  4  0  4  0  0  4  4  4  4  0  4  0  4  4  4  0  4
 0  0  0  0  0  0  4  0  4  0  0  0  4  0  0  4  0  4  0  4  4  4  0  0  4  4  4  4  4  0  4  0  4  0  0  4  4  0  0  0  4  0

generates a code of length 42 over Z8 who´s minimum homogenous weight is 36.

Homogenous weight enumerator: w(x)=1x^0+151x^36+168x^37+284x^38+392x^39+412x^40+448x^41+422x^42+496x^43+402x^44+392x^45+214x^46+136x^47+81x^48+16x^49+34x^50+39x^52+6x^54+2x^56

The gray image is a code over GF(2) with n=168, k=12 and d=72.
This code was found by Heurico 1.16 in 34.8 seconds.