The generator matrix

 1  0  0  0  1  1  1  1  1  2  1  1  1  1  1  1  1  1  1  1  1  1 2a+2  1  1  1  0  1  1  1  1 2a+2 2a+2  1  1  1  1  1  1  1  1 2a+2 2a+2  1  1  1  1  1  1  1  1  1  1
 0  1  0  0  0  2  2 2a+3 2a+1  1 3a 3a+3 a+2 a+3 a+1 2a 3a 2a+2 2a 2a+1 a+3 2a+1  1  3 3a+1 3a+2  1 a+2 3a+3 3a+3  a  1 2a+2 3a+1  1 3a+2  3  3 2a  2 3a+2  1  1  0 3a+3  2  0  0 3a+2  3 3a+1 3a  0
 0  0  1  0  1 3a+2 a+1  a 2a+2 3a+2 2a+3 3a+1  a 3a+2 3a+3  0 3a 3a+3  a a+3  0  1 3a+1 3a 2a+1 a+2  1 a+1 2a+2  a 2a+3 a+1  1 a+2 2a+3 3a+2 3a 2a+1 3a+3 3a+3 3a+1 2a+3  2 2a+1 3a+3  2  a 3a+3 a+3 a+1 2a+3  2  0
 0  0  0  1 3a+3  a  1  2 a+2 a+2  0  2 3a+1 2a+3 3a+1 a+2  0  2 a+3  a 3a+1  3 2a+2 2a+1 a+2 2a+1  a 3a+2  1 a+1 3a+1 3a+2 2a+3 3a  0 3a 2a+1 3a+2 3a+2 a+3  1  3  1  2  3  3  3 3a+3 2a a+3 3a 3a+3  0
 0  0  0  0  2  0 2a  0  0  0  2 2a  2 2a  2 2a 2a+2 2a+2 2a+2 2a  0  0 2a  2  0 2a 2a  2  2 2a 2a+2  2 2a 2a 2a+2  2 2a  2  0  2 2a+2  0 2a 2a+2 2a+2 2a+2  2 2a+2  2 2a+2 2a+2 2a+2 2a

generates a code of length 53 over GR(16,4) who´s minimum homogenous weight is 140.

Homogenous weight enumerator: w(x)=1x^0+192x^140+348x^141+324x^142+936x^143+2148x^144+2280x^145+2076x^146+2904x^147+5892x^148+5172x^149+4440x^150+5628x^151+11031x^152+9276x^153+7908x^154+10260x^155+17706x^156+14676x^157+11604x^158+13284x^159+22845x^160+16956x^161+12132x^162+12816x^163+18819x^164+12876x^165+7824x^166+7380x^167+9087x^168+5076x^169+2556x^170+1956x^171+2184x^172+912x^173+288x^174+132x^175+144x^176+12x^177+30x^180+15x^184+6x^188+6x^192+3x^196+3x^200

The gray image is a code over GF(4) with n=212, k=9 and d=140.
This code was found by Heurico 1.16 in 201 seconds.