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
 0  3  0  0  0  3  3  3 3a 6a+3  0  3 3a 6a+6 6a  6 6a+6  6 6a+6 6a+6  0  3 3a 6a+3 6a+6 6a+3 6a+6 6a+6  0
 0  0  3  0  0 3a+6 6a+6 3a  6 3a+6  3 3a+6 3a 3a+3  3 3a+6  3 3a 3a+6  6 6a+3 3a+6 3a+3  0  3 6a 6a+6  3  0
 0  0  0  3  0 3a+6  3 3a+3 3a+3 6a+6 6a+3 6a+6 6a+3 6a  3  3 6a  6  6 6a 6a+3 3a 3a 3a  0 3a+6  6 3a+6  0
 0  0  0  0  3 6a+6  6 6a+3  3  3 3a 3a  3 3a+3  0  6 6a 3a+6 6a 6a+3 3a+3 3a+3  0  3 3a 6a 6a+3  0 3a+3

generates a code of length 29 over GR(81,9) who´s minimum homogenous weight is 189.

Homogenous weight enumerator: w(x)=1x^0+360x^189+2048x^198+4088x^207+6408x^216+10280x^225+472392x^232+14168x^234+12896x^243+7040x^252+1760x^261

The gray image is a code over GF(9) with n=261, k=6 and d=189.
This code was found by Heurico 1.16 in 38 seconds.