The generator matrix

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

generates a code of length 71 over Z8 who´s minimum homogenous weight is 68.

Homogenous weight enumerator: w(x)=1x^0+146x^68+138x^70+107x^72+76x^74+29x^76+10x^78+4x^80+1x^132

The gray image is a code over GF(2) with n=284, k=9 and d=136.
This code was found by Heurico 1.16 in 0.162 seconds.