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

generates a code of length 70 over Z8 who´s minimum homogenous weight is 69.

Homogenous weight enumerator: w(x)=1x^0+28x^69+78x^70+14x^72+4x^77+1x^78+1x^80+1x^94

The gray image is a code over GF(2) with n=280, k=7 and d=138.
This code was found by Heurico 1.16 in 0.163 seconds.