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

generates a code of length 54 over GR(16,4) who´s minimum homogenous weight is 140.

Homogenous weight enumerator: w(x)=1x^0+126x^140+309x^144+429x^148+885x^152+1983x^156+4128x^160+4749x^164+2616x^168+342x^172+330x^176+255x^180+120x^184+81x^188+24x^192+3x^196+3x^200

The gray image is a code over GF(4) with n=216, k=7 and d=140.
This code was found by Heurico 1.16 in 2.34 seconds.