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

generates a code of length 27 over GR(81,9) who´s minimum homogenous weight is 171.

Homogenous weight enumerator: w(x)=1x^0+280x^171+1680x^180+3416x^189+5672x^198+5832x^200+9256x^207+93312x^209+13656x^216+373248x^218+13776x^225+8720x^234+2592x^243

The gray image is a code over GF(9) with n=243, k=6 and d=171.
This code was found by Heurico 1.16 in 34 seconds.