The generator matrix

 1  0  1  1  1 X+2  1  1 3X  1  1 2X+2  1  1  1  1  0 X+2  1  1  1  1 2X+2 3X  1  1  1  1 2X  1  1
 0  1 X+1 X+2  3  1 2X+2 3X+3  1 3X 2X+1  1  0 X+2 X+1  3  1  1 2X+2 3X 3X+3 2X+1  1  1 2X 3X+2  2  X  0 2X 3X+2
 0  0 2X 2X  0 2X 2X  0  0  0 2X 2X 2X  0  0 2X 2X  0  0 2X 2X  0  0 2X 2X  0  0 2X 2X  0 2X

generates a code of length 31 over Z4[X]/(X^2+2) who´s minimum homogenous weight is 29.

Homogenous weight enumerator: w(x)=1x^0+24x^29+270x^30+48x^31+77x^32+24x^33+66x^34+2x^44

The gray image is a code over GF(2) with n=248, k=9 and d=116.
This code was found by Heurico 1.16 in 0.015 seconds.