The generator matrix

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

generates a code of length 28 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 51.

Homogenous weight enumerator: w(x)=1x^0+588x^51+2016x^54+3252x^57+438x^60+222x^63+42x^66+2x^81

The gray image is a code over GF(3) with n=252, k=8 and d=153.
This code was found by Heurico 1.16 in 2.79 seconds.