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

generates a code of length 28 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 53.

Homogenous weight enumerator: w(x)=1x^0+324x^53+240x^54+972x^56+486x^57+162x^62+2x^81

The gray image is a code over GF(3) with n=252, k=7 and d=159.
This code was found by Heurico 1.16 in 0.017 seconds.