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

generates a code of length 78 over Z8 who´s minimum homogenous weight is 69.

Homogenous weight enumerator: w(x)=1x^0+52x^69+136x^70+164x^71+180x^72+224x^73+228x^74+292x^75+349x^76+338x^77+345x^78+338x^79+322x^80+250x^81+192x^82+172x^83+123x^84+94x^85+95x^86+64x^87+31x^88+26x^89+25x^90+24x^91+16x^92+4x^93+2x^95+2x^96+4x^97+2x^98+1x^114

The gray image is a code over GF(2) with n=312, k=12 and d=138.
This code was found by Heurico 1.16 in 1.43 seconds.