The generator matrix

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

generates a code of length 63 over Z2[X]/(X^4) who´s minimum homogenous weight is 58.

Homogenous weight enumerator: w(x)=1x^0+71x^58+220x^59+601x^60+420x^61+671x^62+348x^63+604x^64+314x^65+447x^66+202x^67+130x^68+12x^69+25x^70+12x^71+6x^72+4x^73+1x^76+1x^80+2x^81+2x^82+2x^83

The gray image is a linear code over GF(2) with n=504, k=12 and d=232.
This code was found by Heurico 1.16 in 0.359 seconds.