The generator matrix

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

generates a code of length 39 over Z7[X]/(X^2) who´s minimum homogenous weight is 231.

Homogenous weight enumerator: w(x)=1x^0+342x^231+1050x^232+252x^233+282x^238+420x^239+42x^240+12x^245

The gray image is a linear code over GF(7) with n=273, k=4 and d=231.
This code was found by Heurico 1.16 in 0.00652 seconds.