The generator matrix

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

generates a code of length 56 over Z4[X]/(X^3+2,2X) who´s minimum homogenous weight is 56.

Homogenous weight enumerator: w(x)=1x^0+252x^56+1x^64+2x^80

The gray image is a code over GF(2) with n=448, k=8 and d=224.
This code was found by Heurico 1.16 in 0.047 seconds.