The generator matrix

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

generates a code of length 7 over Z3[X]/(X^3) who´s minimum homogenous weight is 6.

Homogenous weight enumerator: w(x)=1x^0+20x^6+30x^9+50x^12+1944x^14+70x^15+50x^18+22x^21

The gray image is a linear code over GF(3) with n=63, k=7 and d=18.
This code was found by Heurico 1.16 in 0.000802 seconds.