The generator matrix

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

generates a code of length 48 over F4[X,sigma]/(X^2) who´s minimum homogenous weight is 133.

Homogenous weight enumerator: w(x)=1x^0+372x^133+684x^134+192x^136+1104x^137+1824x^138+303x^140+1212x^141+2136x^142+168x^144+1488x^145+2244x^146+132x^148+1212x^149+1488x^150+126x^152+480x^153+780x^154+90x^156+276x^157+60x^158+3x^160+6x^168+3x^172

The gray image is a linear code over GF(4) with n=192, k=7 and d=133.
This code was found by Heurico 1.16 in 1.11 seconds.