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

generates a code of length 91 over Z4[X]/(X^2+2) who´s minimum homogenous weight is 89.

Homogenous weight enumerator: w(x)=1x^0+38x^89+27x^90+400x^91+20x^92+8x^93+4x^94+11x^96+2x^121+1x^122

The gray image is a code over GF(2) with n=728, k=9 and d=356.
This code was found by Heurico 1.16 in 0.875 seconds.