The generator matrix

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

generates a code of length 33 over Z3[X]/(X^2) who´s minimum homogenous weight is 63.

Homogenous weight enumerator: w(x)=1x^0+362x^63+192x^66+18x^69+110x^72+42x^75+4x^81

The gray image is a linear code over GF(3) with n=99, k=6 and d=63.
As d=63 is an upper bound for linear (99,6,3)-codes, this code is optimal over Z3[X]/(X^2) for dimension 6.
This code was found by Heurico 1.16 in 1.52 seconds.