The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  3  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  3  0 6a  3 6a+6 3a 6a  3  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 6a 6a+3 6a 3a+6  3  6 3a+6 3a+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+6 6a+3 6a 3a 3a+6 3a+3 6a  0  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 3a+3 3a+3  3  0 6a+6 6a+3 6a+3  0

generates a code of length 28 over GR(81,9) who´s minimum homogenous weight is 180.

Homogenous weight enumerator: w(x)=1x^0+408x^180+2032x^189+3552x^198+6152x^207+62232x^216+433328x^225+13384x^234+8104x^243+2248x^252

The gray image is a code over GF(9) with n=252, k=6 and d=180.
This code was found by Heurico 1.16 in 36.3 seconds.