The generator matrix

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

generates a code of length 48 over F4[X,sigma]/(X^2) who´s minimum homogenous weight is 126.

Homogenous weight enumerator: w(x)=1x^0+372x^126+744x^127+387x^128+540x^129+3156x^130+3048x^131+1482x^132+1992x^133+7500x^134+7560x^135+3681x^136+4584x^137+14652x^138+13812x^139+6192x^140+7548x^141+23904x^142+20940x^143+9402x^144+10620x^145+26556x^146+21792x^147+8748x^148+8016x^149+19692x^150+13872x^151+4227x^152+3072x^153+7572x^154+3972x^155+567x^156+492x^157+1044x^158+276x^159+57x^160+30x^164+15x^168+15x^172+3x^176+6x^180+3x^184

The gray image is a linear code over GF(4) with n=192, k=9 and d=126.
This code was found by Heurico 1.16 in 172 seconds.