The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1
 0  X  0  0  X  0  X  X 2X  0  0  X  X 2X 2X 2X  0  X
 0  0  X  0 2X  X 2X  X 2X  0  X  X  0  0  0  X 2X  X
 0  0  0  X 2X 2X  0 2X 2X 2X  X  0 2X  0  X 2X  0  X

generates a code of length 18 over Z3[X]/(X^2) who´s minimum homogenous weight is 33.

Homogenous weight enumerator: w(x)=1x^0+36x^33+186x^36+18x^42+2x^54

The gray image is a linear code over GF(3) with n=54, k=5 and d=33.
This code was found by Heurico 1.16 in 0.000957 seconds.