The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  2  2  2
 0  2  0  6  0  6  0  2  0  6  0  2  0  6  0  2  0  6  0  2  0  6  0  2  0  6  0  2  0  6  0  2  4  6  4  2  4  6  4  2  4  6  4  2  4  6  4  2  4  6  4  6  4  2  4  2  4  6  4  6  4  2  4  2  0  6  0  6  6  6  0
 0  0  4  0  0  0  4  0  0  0  0  0  4  0  4  0  0  4  0  4  0  4  0  4  4  4  4  4  4  4  4  4  4  0  4  0  4  0  4  0  4  0  4  0  0  4  0  4  4  4  0  4  0  4  4  4  0  0  0  4  0  4  0  0  0  0  0  0  0  4  4
 0  0  0  4  0  0  0  4  0  0  0  0  0  4  0  4  4  4  4  4  4  4  4  4  4  0  4  0  4  0  4  0  0  0  0  0  0  0  0  0  4  4  4  4  4  4  4  4  4  4  0  0  4  0  4  0  0  4  4  0  0  4  0  4  0  0  0  0  4  4  0
 0  0  0  0  4  0  4  0  0  4  4  4  4  4  0  4  4  0  4  0  0  4  0  4  0  4  0  4  4  0  4  0  0  0  0  0  4  4  4  4  4  4  4  4  0  0  0  0  0  4  4  0  4  4  0  0  0  0  4  4  4  4  0  0  0  0  0  4  4  0  0
 0  0  0  0  0  4  0  4  4  4  4  0  4  0  4  4  0  0  4  4  4  0  0  4  0  4  4  0  4  4  0  0  0  0  4  4  4  0  0  4  0  4  4  0  0  4  4  0  4  4  0  0  4  4  0  4  4  4  0  0  4  0  0  0  0  0  4  4  0  0  0

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

Homogenous weight enumerator: w(x)=1x^0+45x^68+32x^69+72x^70+192x^71+106x^72+32x^73+24x^74+7x^76+1x^136

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 0.195 seconds.