The generator matrix

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

generates a code of length 54 over Z2[X]/(X^3) who´s minimum homogenous weight is 54.

Homogenous weight enumerator: w(x)=1x^0+48x^54+13x^56+1x^64+1x^72

The gray image is a linear code over GF(2) with n=216, k=6 and d=108.
As d=108 is an upper bound for linear (216,6,2)-codes, this code is optimal over Z2[X]/(X^3) for dimension 6.
This code was found by Heurico 1.16 in 0.0368 seconds.