The generator matrix

 1  0  0  0  1  1  1  0  1  4  1  1  4  2  1  1  1  1  6  2  1  6  1  0  6  4  0  1  1  1  1  4  4  6  1  1  1  1  6  0  1  1  1  6  1  1  1  2  6  1  1  1  1  6  4  0  2  4  4  1  1  0  1  4  1  6  1  1  1
 0  1  0  0  0  4  4  4  1  1  3  5  1  1  5  5  4  7  1  1  2  6  4  2  1  6  1  5  3  3  2  1  4  6  2  1  2  1  1  1  1  0  1  1  0  4  3  1  0  6  7  4  7  2  2  1  1  6  2  7  7  1  0  4  0  4  2  1  4
 0  0  1  0  4  1  5  1  5  1  0  0  0  3  5  4  4  3  7  1  1  1  2  1  6  6  0  3  6  0  3  6  1  2  4  3  2  5  1  7  6  3  7  4  1  2  1  2  0  6  6  7  0  4  1  2  6  1  1  1  3  7  7  1  2  6  0  6  4
 0  0  0  1  7  7  0  3  4  0  4  3  3  3  7  4  1  0  4  1  4  7  2  2  3  1  6  1  5  6  3  2  1  1  0  7  1  6  6  7  5  2  0  2  5  4  3  5  1  7  4  7  1  1  4  3  2  3  1  5  5  1  5  2  6  1  1  4  0

generates a code of length 69 over Z8 who´s minimum homogenous weight is 63.

Homogenous weight enumerator: w(x)=1x^0+158x^63+258x^64+460x^65+397x^66+492x^67+373x^68+394x^69+249x^70+272x^71+211x^72+192x^73+147x^74+190x^75+87x^76+90x^77+35x^78+38x^79+30x^80+16x^81+4x^82+2x^83

The gray image is a code over GF(2) with n=276, k=12 and d=126.
This code was found by Heurico 1.16 in 0.627 seconds.