The generator matrix

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

generates a code of length 24 over Z9[X]/(X^2+3,3X) who´s minimum homogenous weight is 48.

Homogenous weight enumerator: w(x)=1x^0+72x^48+8x^54

The gray image is a code over GF(3) with n=216, k=4 and d=144.
This code was found by Heurico 1.16 in 0.00237 seconds.