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  2  2  1  1  1  1  1
 0  2  0  0  0  2  2  2 2a  0  2 2a 2a 2a 2a  2 2a 2a^2+2a+2  0  0  2 2a^2+2 2a^2+2a+2 2a+2 2a^2 2a+2  0 2a+2 2a^2 2a^2 2a^2+2a+2 2a^2+2a+2  2  2 2a+2 2a  0 2a+2  0
 0  0  2  0  0 2a^2+2 2a^2+2a+2 2a^2+2a 2a^2+2a  2 2a+2 2a^2+2  0  2 2a^2+2a+2 2a^2 2a 2a^2+2 2a^2 2a  0 2a^2+2a  2  0 2a^2+2a 2a^2 2a^2 2a^2+2 2a^2  0 2a^2+2 2a^2+2a+2 2a^2+2 2a^2+2a+2 2a+2 2a  2 2a^2+2a  0
 0  0  0  2  0  2 2a^2+2a+2 2a 2a+2 2a^2 2a^2+2  0 2a^2+2a+2  2 2a 2a^2+2a 2a^2+2a 2a^2+2a  2 2a^2+2a 2a 2a 2a^2+2a 2a^2+2a 2a+2  0 2a^2  0 2a^2+2a  2  0  2 2a 2a^2+2a 2a^2  2 2a^2+2a+2 2a+2  0
 0  0  0  0  2 2a^2+2 2a+2 2a 2a^2+2a+2 2a 2a^2 2a^2 2a+2  0 2a  0 2a^2 2a^2+2a 2a^2+2a  2 2a+2 2a^2+2a+2 2a^2+2 2a+2  2 2a 2a^2+2 2a^2  2 2a^2 2a^2+2a+2 2a  2 2a^2+2a 2a+2  0  2 2a^2+2 2a+2

generates a code of length 39 over GR(64,4) who´s minimum homogenous weight is 232.

Homogenous weight enumerator: w(x)=1x^0+294x^232+1337x^240+2408x^248+3290x^256+3584x^259+4732x^264+50176x^267+5558x^272+175616x^275+5859x^280+5411x^288+2828x^296+931x^304+119x^312

The gray image is a code over GF(8) with n=312, k=6 and d=232.
This code was found by Heurico 1.16 in 22.5 seconds.