The generator matrix

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

generates a code of length 23 over GR(16,4) who´s minimum homogenous weight is 63.

Homogenous weight enumerator: w(x)=1x^0+408x^63+150x^64+288x^65+240x^66+936x^67+240x^68+192x^69+360x^71+174x^72+288x^73+144x^74+600x^75+72x^76+3x^80

The gray image is a code over GF(4) with n=92, k=6 and d=63.
This code was found by Heurico 1.16 in 0.016 seconds.