The generator matrix

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

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+276x^31+864x^32+1270x^33+2184x^34+2268x^35+4188x^36+4104x^37+2862x^38+1248x^39+390x^40+14x^42+12x^43+2x^45

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 0.217 seconds.