The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  X  1  1  1  1  1  1  1  1
 0  6  0  0  0  0  6  3  3  0  0  6  6  6  6  6  6  0  6  6  3  6  0  0  6  0  3  3
 0  0  6  0  0  6  3  0  3  0  6  6  3  3  0  6  0  6  3  0  3  3  6  3  6  0  6  3
 0  0  0  6  0  3  3  6  0  6  6  0  0  6  3  6  6  0  3  6  6  6  6  0  0  3  0  6
 0  0  0  0  6  3  3  3  3  3  0  3  0  0  3  3  0  3  0  6  0  3  6  0  6  6  6  3

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

Homogenous weight enumerator: w(x)=1x^0+90x^51+240x^54+1458x^56+324x^57+36x^60+36x^69+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 1.46 seconds.