The generator matrix

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

generates a code of length 70 over Z3[X]/(X^2) who´s minimum homogenous weight is 138.

Homogenous weight enumerator: w(x)=1x^0+30x^138+162x^140+36x^141+6x^144+6x^156+2x^162

The gray image is a linear code over GF(3) with n=210, k=5 and d=138.
This code was found by Heurico 1.16 in 0.0537 seconds.