The generator matrix

 1  1  1  1  1  1  1  1  X
 0  X  0  X a*X a*X a^7*X a^7*X  X
 0  0  X a^7*X a*X a^7*X  X a*X a^5*X

generates a code of length 9 over F9[X]/(X^2) who´s minimum homogenous weight is 63.

Homogenous weight enumerator: w(x)=1x^0+288x^63+648x^64+144x^72+5184x^73+296x^81

The gray image is a linear code over GF(9) with n=81, k=4 and d=63.
This code was found by Heurico 1.16 in 0.0013 seconds.