The generator matrix

 1  0  0  1  1  1  1  1  1 2X+6  1  1  1  1  1  X  1 X+3
 0  1  0 2X+6  1 2X+7  8  3 X+8  1 2X+4 2X+2  X X+4  7  1 X+6 X+3
 0  0  1 2X+7  1 2X+6 2X+8  5  X  7 2X+2 2X+1 2X  3 X+1  4 X+8  1

generates a code of length 18 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 31.

Homogenous weight enumerator: w(x)=1x^0+252x^31+918x^32+1184x^33+1668x^34+3300x^35+4508x^36+2832x^37+3336x^38+1188x^39+420x^40+60x^41+4x^42+12x^43

The gray image is a code over GF(3) with n=162, k=9 and d=93.
This code was found by Heurico 1.16 in 0.235 seconds.