The generator matrix

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

generates a code of length 18 over Z3[X]/(X^2) who´s minimum homogenous weight is 30.

Homogenous weight enumerator: w(x)=1x^0+232x^30+436x^33+778x^36+616x^39+100x^42+4x^45+16x^48+4x^51

The gray image is a linear code over GF(3) with n=54, k=7 and d=30.
This code was found by Heurico 1.16 in 26.4 seconds.