The generator matrix

 1  0  1  1  1  1  1  1  1  0  1  1  1  0  1  1  X  1  1  1  1  1  1  1  X  1  1  1  1 aX  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  0  1  1  1  X  1  1
 0  1  1  a (a+1)X+a+1  0 (a+1)X+1  a (a+1)X+a+1  1  0  a (a+1)X+1  1 (a+1)X+a+1 X+a  1  X (a+1)X+1 aX+a+1 X+a  X  1 aX+a+1  1  X aX+1 a+1 X+a  1  0 aX+1  a aX+a+1  X (a+1)X+a+1 aX+a+1 (a+1)X+a aX a+1 a+1 a+1 aX+a+1 X+a+1  1  a (a+1)X+a aX+a (a+1)X+a X+a X+1 (a+1)X+a a+1 X+a (a+1)X+a+1 aX (a+1)X+a  X aX+1  0 aX aX  0  1 aX  1  1 aX+1  X (a+1)X+1  1  a (a+1)X+a+1
 0  0 (a+1)X  0  X  X (a+1)X  X (a+1)X  X  0  0  X  X  0 (a+1)X aX aX  0 (a+1)X aX (a+1)X aX aX (a+1)X  X  X  0  X (a+1)X (a+1)X (a+1)X  X  0  X (a+1)X (a+1)X  0  0  X  X aX aX  0  X (a+1)X aX (a+1)X aX aX aX  0 aX  X  X (a+1)X (a+1)X aX (a+1)X  X  0 (a+1)X (a+1)X aX  X (a+1)X aX  0 (a+1)X  X  X  X (a+1)X
 0  0  0  X aX  X aX (a+1)X (a+1)X  0  X (a+1)X  0 aX aX (a+1)X  0  X  0 aX (a+1)X  X  0 aX  0  0 aX (a+1)X  X aX  0 (a+1)X aX  X (a+1)X  0  X aX (a+1)X  0  X  X  0  0 (a+1)X aX aX  X  X  0 aX  0 (a+1)X  0 (a+1)X (a+1)X  0 (a+1)X aX aX aX  X aX (a+1)X  X (a+1)X  X (a+1)X  0 aX  X  X  X

generates a code of length 73 over F4[X,sigma]/(X^2) who´s minimum homogenous weight is 212.

Homogenous weight enumerator: w(x)=1x^0+912x^212+1527x^216+513x^220+369x^224+393x^228+321x^232+51x^236+3x^240+3x^244+3x^256

The gray image is a linear code over GF(4) with n=292, k=6 and d=212.
This code was found by Heurico 1.16 in 19.4 seconds.