The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1
 0  X 2X  0 X+6 2X  0 X+6 2X  3 X+6 2X  0  3 X+6 2X+3  X 2X+6
 0  0  3  0  0  0  3  6  3  3  6  3  3  3  0  0  0  3
 0  0  0  3  0  3  3  6  3  0  3  6  6  0  6  0  6  0
 0  0  0  0  6  6  3  6  6  3  6  0  0  0  0  6  6  6

generates a code of length 18 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 30.

Homogenous weight enumerator: w(x)=1x^0+270x^30+288x^33+5370x^36+468x^39+144x^42+18x^48+2x^54

The gray image is a code over GF(3) with n=162, k=8 and d=90.
This code was found by Heurico 1.16 in 40.1 seconds.