The generator matrix

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

generates a code of length 11 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 18.

Homogenous weight enumerator: w(x)=1x^0+180x^18+324x^20+180x^21+486x^22+648x^23+306x^24+62x^27

The gray image is a code over GF(3) with n=99, k=7 and d=54.
This code was found by Heurico 1.16 in 0.00397 seconds.