The generator matrix

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

generates a code of length 4 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 3.

Homogenous weight enumerator: w(x)=1x^0+8x^3+162x^4+1860x^6+648x^7+12636x^8+3704x^9+648x^10+16x^12

The gray image is a code over GF(3) with n=36, k=9 and d=9.
This code was found by Heurico 1.16 in 0.0108 seconds.