The generator matrix

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

generates a code of length 21 over Z8 who´s minimum homogenous weight is 17.

Homogenous weight enumerator: w(x)=1x^0+220x^17+434x^18+528x^19+524x^20+696x^21+570x^22+522x^23+345x^24+188x^25+42x^26+20x^27+2x^28+2x^30+2x^31

The gray image is a code over GF(2) with n=84, k=12 and d=34.
This code was found by Heurico 1.16 in 1.01 seconds.