The generator matrix

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

generates a code of length 12 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 20.

Homogenous weight enumerator: w(x)=1x^0+84x^20+26x^21+324x^22+90x^23+1000x^24+432x^25+108x^26+20x^27+54x^28+42x^29+4x^30+2x^33

The gray image is a code over GF(3) with n=108, k=7 and d=60.
This code was found by Heurico 1.16 in 0.0165 seconds.