The generator matrix

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

generates a code of length 21 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 40.

Homogenous weight enumerator: w(x)=1x^0+30x^40+178x^42+18x^43+8x^45+6x^49+2x^51

The gray image is a code over GF(3) with n=189, k=5 and d=120.
This code was found by Heurico 1.16 in 0.00223 seconds.