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

generates a code of length 91 over Z3[X]/(X^2) who´s minimum homogenous weight is 177.

Homogenous weight enumerator: w(x)=1x^0+72x^177+222x^180+324x^183+90x^186+18x^189+2x^270

The gray image is a linear code over GF(3) with n=273, k=6 and d=177.
This code was found by Heurico 1.16 in 0.122 seconds.