The generator matrix

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

generates a code of length 9 over F9[X]/(X^2) who´s minimum homogenous weight is 45.

Homogenous weight enumerator: w(x)=1x^0+1008x^45+2688x^54+12096x^63+495144x^72+20504x^81

The gray image is a linear code over GF(9) with n=81, k=6 and d=45.
This code was found by Heurico 1.16 in 3.76 seconds.