The generator matrix

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

generates a code of length 18 over Z9[X]/(X^2+3,3X) who´s minimum homogenous weight is 32.

Homogenous weight enumerator: w(x)=1x^0+180x^32+84x^33+252x^34+252x^35+564x^36+378x^37+306x^38+66x^39+72x^41+12x^42+18x^43+2x^45

The gray image is a code over GF(3) with n=162, k=7 and d=96.
This code was found by Heurico 1.16 in 44.9 seconds.