The generator matrix

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

generates a code of length 83 over Z4[X]/(X^3+2,2X) who´s minimum homogenous weight is 78.

Homogenous weight enumerator: w(x)=1x^0+447x^78+40x^79+512x^80+256x^81+615x^82+432x^83+625x^84+256x^85+501x^86+40x^87+238x^88+85x^90+19x^92+16x^94+12x^96+1x^136

The gray image is a code over GF(2) with n=664, k=12 and d=312.
This code was found by Heurico 1.16 in 15.9 seconds.