The generator matrix

 1  0  1  1  1  1  1 X+6  1  1  1 2X  1  1  0  1  1  1  1  1  1  1  1  1  1  1  1  1
 0  1 2X+7  8 X+6 X+1 X+5  1 2X 2X+8  7  1 X+1 X+6  1  8 X+5 2X+8  0 2X  8  2 2X 2X+3 X+5 X+3 X+2 X+6
 0  0  6  0  6  3  3  3  0  0  3  0  3  6  0  6  3  3  0  6  0  3  0  6  6  6  3  0
 0  0  0  3  6  6  3  0  3  6  0  6  3  0  3  6  0  6  6  3  0  6  0  0  3  3  6  6

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+370x^51+216x^52+1432x^54+864x^55+2230x^57+864x^58+544x^60+30x^63+2x^66+2x^69+4x^72+2x^78

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 0.052 seconds.