The generator matrix

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

generates a code of length 26 over Z8 who´s minimum homogenous weight is 20.

Homogenous weight enumerator: w(x)=1x^0+490x^20+536x^21+2336x^22+1740x^23+4912x^24+2716x^25+6798x^26+3104x^27+5488x^28+1680x^29+2006x^30+396x^31+431x^32+60x^33+58x^34+8x^35+6x^36+2x^38

The gray image is a code over GF(2) with n=104, k=15 and d=40.
This code was found by Heurico 1.11 in 108 seconds.