The generator matrix

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

generates a code of length 6 over Z7[X]/(X^2) who´s minimum homogenous weight is 30.

Homogenous weight enumerator: w(x)=1x^0+252x^30+36x^35+588x^36+1512x^37+12x^42

The gray image is a linear code over GF(7) with n=42, k=4 and d=30.
This code was found by Heurico 1.16 in 0.000173 seconds.