The generator matrix

 1  0  1  1  1  1  1  1  1  X  1  1  1  1 a*X  1  1  1  1 a^2*X  1  1  1  1  0  1  1  1  1  X  1  1  1  1 a*X  1  1  1  1 a^2*X  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  0  X a*X a^2*X  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1
 0  1 a^2*X+1  a a^2*X+a^2  X a*X+1 X+a a*X+a^2  1 a*X X+1 a*X+a X+a^2  1 a^2*X  1 a^2*X+a a^2  1  0 a^2*X+1  a a^2*X+a^2  1  X a*X+1 X+a a*X+a^2  1 a*X X+1 a*X+a X+a^2  1 a^2*X  1 a^2*X+a a^2  1  0 a^2*X+1  a  X a*X+1 X+a a^2*X+a^2 a*X+a^2 a*X X+1 a*X+a X+a^2 a^2*X  1 a^2*X+a a^2  1  1  1  1  0  X a*X a^2*X a^2*X+1 a*X+1 X+1  1  a X+a a*X+a a^2*X+a  0  X a*X

generates a code of length 75 over F4[X]/(X^2) who´s minimum homogenous weight is 224.

Homogenous weight enumerator: w(x)=1x^0+39x^224+192x^225+12x^228+6x^236+6x^252

The gray image is a linear code over GF(4) with n=300, k=4 and d=224.
This code was found by Heurico 1.16 in 0.063 seconds.