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

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

Homogenous weight enumerator: w(x)=1x^0+36x^69+10x^70+8x^71+2x^72+4x^73+2x^74+1x^80

The gray image is a code over GF(2) with n=276, k=6 and d=138.
This code was found by Heurico 1.16 in 0.145 seconds.