The generator matrix

 1  0  0  1  1  1  1  1  1 2X  1  1  1  1 2X  1  X  X  1  1  1  1  1  1  1  1  X  1  X  0 2X  0  X  1  1  0  1  0  X  1  1  1  1  1  1  1  1  1  1  1  1
 0  1  0 2X  1 2X+1  2  0 X+2  1 2X+2 X+1  X X+2  1 2X+2  1  1 X+2 2X+1  X 2X+1  2 X+2 2X 2X+1 2X X+1  1  1  1  1  1  1  2 2X  0  1  X  0  2  1 2X X+1 2X  X 2X  0 2X+2  0 X+1
 0  0  1 2X+1  1 2X 2X+2  2  X  1 X+2 X+1  1 X+1 2X+2  2  0  X 2X+1 X+2  X  0 X+2 2X  2  2  1 2X X+2 X+1 2X+1  1 2X+2  0  X  1 X+2  X  1  1 2X 2X+1 X+2 2X+1 X+1 X+1  1 X+1 2X+1  X  2

generates a code of length 51 over Z3[X]/(X^2) who´s minimum homogenous weight is 99.

Homogenous weight enumerator: w(x)=1x^0+374x^99+192x^102+18x^105+82x^108+42x^111+20x^117

The gray image is a linear code over GF(3) with n=153, k=6 and d=99.
This code was found by Heurico 1.16 in 6.04 seconds.