The generator matrix

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

generates a code of length 17 over Z3[X]/(X^2) who´s minimum homogenous weight is 30.

Homogenous weight enumerator: w(x)=1x^0+220x^30+158x^33+240x^36+102x^39+4x^42+2x^45+2x^48

The gray image is a linear code over GF(3) with n=51, k=6 and d=30.
This code was found by Heurico 1.16 in 0.214 seconds.