The generator matrix

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

generates a code of length 91 over Z3[X]/(X^2) who´s minimum homogenous weight is 171.

Homogenous weight enumerator: w(x)=1x^0+324x^171+984x^174+1272x^177+1034x^180+834x^183+630x^186+486x^189+426x^192+270x^195+154x^198+60x^201+78x^204+8x^207

The gray image is a linear code over GF(3) with n=273, k=8 and d=171.
This code was found by Heurico 1.16 in 0.913 seconds.