The generator matrix

 1  0  1  1  1  6  1  1  6  1  1  0  1  1  4  1  1  2  1  1  2  1  1  4  1  1  1  1  0  6  1  1  1  1  0  6  1  1  1  1  1  1  1  1  0  4  2  2  4  2  2  4  2  2  2  2  0  2  2  4  1  1  4  1  1  0  1  0  1  1
 0  1  3  6  5  1  0  3  1  6  5  1  4  7  1  2  1  1  4  7  1  2  1  1  0  6  3  5  1  1  0  6  3  5  1  1  4  2  7  1  4  2  7  1  2  1  0  6  1  4  2  2  1  1  0  6  2  4  2  2  0  0  4  6  6  4  3  4  5  3
 0  0  4  4  0  4  4  0  0  0  4  4  4  4  4  0  0  0  0  0  4  4  4  0  0  4  0  4  0  4  4  0  4  0  4  0  4  0  4  0  0  4  0  4  4  4  4  4  0  4  4  4  4  0  0  0  0  0  0  0  0  4  4  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+52x^69+15x^70+32x^71+15x^72+4x^73+8x^75+1x^78

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 0.133 seconds.