The generator matrix

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

generates a code of length 78 over Z3[X]/(X^3) who´s minimum homogenous weight is 156.

Homogenous weight enumerator: w(x)=1x^0+216x^156+18x^159+2x^162+6x^171

The gray image is a linear code over GF(3) with n=702, k=5 and d=468.
This code was found by Heurico 1.16 in 0.175 seconds.