The generator matrix

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

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+422x^48+1250x^51+324x^52+3784x^54+1296x^55+2916x^56+6218x^57+1296x^58+1514x^60+572x^63+74x^66+8x^69+8x^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 0.731 seconds.