The generator matrix

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

generates a code of length 57 over Z8 who´s minimum homogenous weight is 51.

Homogenous weight enumerator: w(x)=1x^0+154x^51+280x^52+246x^53+486x^54+398x^55+483x^56+334x^57+426x^58+284x^59+302x^60+168x^61+194x^62+134x^63+75x^64+46x^65+38x^66+22x^67+10x^68+6x^69+8x^70+1x^72

The gray image is a code over GF(2) with n=228, k=12 and d=102.
This code was found by Heurico 1.16 in 1.25 seconds.