The generator matrix

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

generates a code of length 21 over Z3[X]/(X^2) who´s minimum homogenous weight is 36.

Homogenous weight enumerator: w(x)=1x^0+318x^36+342x^39+756x^42+600x^45+144x^48+26x^54

The gray image is a linear code over GF(3) with n=63, k=7 and d=36.
This code was found by Heurico 1.16 in 81.8 seconds.