The generator matrix

 1  1  1  1  1  1  0  1  1
 0  X  0  0  6  X  3 X+6  X
 0  0  X  0 X+6 2X  X 2X X+6
 0  0  0  X 2X+6 X+3 2X  6  X

generates a code of length 9 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 12.

Homogenous weight enumerator: w(x)=1x^0+156x^12+120x^13+396x^14+442x^15+2016x^16+648x^17+10076x^18+4032x^19+756x^20+732x^21+150x^22+144x^23+14x^24

The gray image is a code over GF(3) with n=81, k=9 and d=36.
This code was found by Heurico 1.16 in 0.107 seconds.