The generator matrix

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

generates a code of length 30 over Z2[X]/(X^3) who´s minimum homogenous weight is 28.

Homogenous weight enumerator: w(x)=1x^0+232x^28+128x^30+81x^32+48x^34+20x^36+2x^40

The gray image is a linear code over GF(2) with n=120, k=9 and d=56.
As d=56 is an upper bound for linear (120,9,2)-codes, this code is optimal over Z2[X]/(X^3) for dimension 9.
This code was found by Heurico 1.16 in 0.264 seconds.