The generator matrix

 1  1  1  1  1  1  1
 0  X  2 3X+2 2X X+2 2X+2

generates a code of length 7 over Z4[X]/(X^2+2X+2) who´s minimum homogenous weight is 6.

Homogenous weight enumerator: w(x)=1x^0+7x^6+112x^7+7x^8+1x^14

The gray image is a code over GF(2) with n=56, k=7 and d=24.
This code was found by Heurico 1.16 in 6.87e-008 seconds.