The generator matrix

 1  0  1  1  1  1  1  3  1  1  1  6  1  1  1  0  1  1  1  3  1  1  1  6  1  1  1  0  1  1  1  3  1  1  1  6  1  1  1  1  1  1  1  1  1  0  3  6  1  1  1  1  1  1  1  1  1  0  3  6  3  3  3  0  1  1  1  1
 0  1  7  8  3  4  2  1  6  1  5  1  0  7  8  1  3  4  2  1  6  1  5  1  0  7  8  1  3  4  2  1  6  1  5  1  0  3  7  4  8  2  6  1  5  1  1  1  0  3  6  7  4  1  8  2  5  1  1  1  0  3  6  3  0  3  7  4

generates a code of length 68 over Z9 who´s minimum homogenous weight is 136.

Homogenous weight enumerator: w(x)=1x^0+24x^136+36x^137+12x^139+4x^141+4x^147

The gray image is a code over GF(3) with n=204, k=4 and d=136.
This code was found by Heurico 1.16 in 0.0301 seconds.