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  X  1  1  1  1
 0  X  0  3 2X X+6  X 2X+6 2X  3 X+6 2X+6  0  3 2X+6 X+3 X+3  0 2X X+6  3 2X+3  X  3 2X X+3  3  6
 0  0  X 2X+6  3 2X+6  X X+6 2X+3  3 X+6 2X  3 X+6  X  6 2X+3 2X 2X+6  0 2X+3 X+6 X+3  X  X 2X+6 X+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+46x^51+42x^52+78x^53+356x^54+60x^55+1008x^56+378x^57+36x^58+18x^59+68x^60+12x^61+30x^62+34x^63+12x^64+6x^66+2x^81

The gray image is a code over GF(3) with n=252, k=7 and d=153.
This code was found by Heurico 1.16 in 0.0143 seconds.