The generator matrix

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

generates a code of length 23 over Z8 who´s minimum homogenous weight is 15.

Homogenous weight enumerator: w(x)=1x^0+58x^15+162x^16+316x^17+618x^18+1222x^19+2250x^20+3716x^21+5092x^22+5648x^23+5280x^24+3916x^25+2240x^26+1192x^27+596x^28+236x^29+108x^30+70x^31+29x^32+8x^33+6x^34+2x^35+2x^36

The gray image is a code over GF(2) with n=92, k=15 and d=30.
This code was found by Heurico 1.16 in 7.99 seconds.