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  1
 0  X  0  0  X  X a*X a^3*X  0 2*X a^2*X  X a^2*X a*X a^2*X a^5*X a*X  X a*X 2*X a^6*X a^2*X a^2*X a*X 2*X a^6*X a^2*X 2*X
 0  0  X  0 a^7*X a^6*X a*X 2*X  X a^6*X a^6*X  X a^3*X  X a^5*X  X a^2*X a^6*X a^5*X a^6*X a^5*X a^7*X a^6*X  X a^2*X a^3*X a^2*X a*X
 0  0  0  X a^7*X  X a^5*X a*X a*X a^7*X 2*X a^7*X a^3*X a^2*X 2*X a^3*X a^6*X 2*X  X a^6*X a^6*X a^5*X a^2*X a^3*X  0  0 a^6*X a^2*X

generates a code of length 28 over F9[X]/(X^2) who´s minimum homogenous weight is 198.

Homogenous weight enumerator: w(x)=1x^0+464x^198+1224x^207+952x^216+52488x^224+1312x^225+1392x^234+952x^243+264x^252

The gray image is a linear code over GF(9) with n=252, k=5 and d=198.
This code was found by Heurico 1.16 in 0.484 seconds.