The generator matrix

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

generates a code of length 71 over Z8 who´s minimum homogenous weight is 69.

Homogenous weight enumerator: w(x)=1x^0+14x^69+92x^70+40x^71+93x^72+8x^73+2x^74+2x^77+1x^82+2x^88+1x^90

The gray image is a code over GF(2) with n=284, k=8 and d=138.
This code was found by Heurico 1.16 in 0.107 seconds.