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  X  X  X  X  X  X  X  X  X  X  1  1  1  1  X  X  1  1  1  1  X  X  X  X  3  1
 0  3  0  0  0  0  3  6  6  0  0  3  3  3  3  3  3  3  0  6  0  6  0  6  0  3  6  3  6  6  0  0  6  3  0  3  3  3  3  0  0  0  3  0  3  0  3  3  3  3  3  6  6  3  3  0  0  3  3  6  6  0  3  6  0  6  6  6  6  3  6
 0  0  3  0  0  3  6  0  6  0  3  3  6  6  0  3  0  3  3  3  3  0  0  6  6  3  3  6  0  6  0  3  3  0  6  6  0  3  0  6  6  6  3  6  6  0  6  6  3  3  0  3  6  0  0  0  0  6  3  0  0  6  3  3  0  3  6  0  0  6  6
 0  0  0  3  0  6  6  3  0  3  3  0  0  3  6  3  3  6  6  0  0  6  6  6  6  6  3  3  0  3  6  3  6  6  3  6  3  0  0  0  3  0  3  6  0  0  6  3  0  6  6  0  6  3  0  0  3  3  0  0  6  6  3  0  6  0  6  0  6  3  0
 0  0  0  0  3  6  6  6  6  6  0  6  0  0  6  6  0  3  0  0  6  6  3  6  3  6  0  6  0  0  6  6  3  0  0  0  6  0  3  3  6  6  3  0  3  3  6  3  3  6  0  3  3  3  3  6  3  3  3  0  0  6  0  6  0  0  6  6  3  6  0

generates a code of length 71 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 135.

Homogenous weight enumerator: w(x)=1x^0+144x^135+144x^138+486x^140+164x^141+972x^143+76x^144+92x^147+50x^150+32x^153+10x^156+6x^162+6x^165+2x^171+2x^177

The gray image is a code over GF(3) with n=639, k=7 and d=405.
This code was found by Heurico 1.16 in 0.201 seconds.