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

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

Homogenous weight enumerator: w(x)=1x^0+30x^69+6x^70+64x^71+9x^72+9x^74+6x^76+1x^82+2x^101

The gray image is a code over GF(2) with n=284, k=7 and d=138.
This code was found by Heurico 1.16 in 1.1 seconds.