The generator matrix

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

generates a code of length 28 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 48.

Homogenous weight enumerator: w(x)=1x^0+186x^48+240x^49+426x^50+474x^51+708x^52+516x^53+2990x^54+1722x^55+2904x^56+5408x^57+1686x^58+726x^59+648x^60+390x^61+222x^62+226x^63+114x^64+66x^65+28x^66+2x^72

The gray image is a code over GF(3) with n=252, k=9 and d=144.
This code was found by Heurico 1.16 in 0.82 seconds.