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  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  1  1  1  1  1  1  1  1  2
 0  2  0  2  0  0  6  6  0  0  2  6  0  0  6  2  0  0  2  2  0  0  6  6  0  0  2  6  0  4  6  6  0  2  4  2  4  6  4  2  4  2  4  2  4  6  6  4  4  2  4  2  4  2  4  6  4  6  4  6  4  4  6  2  0  4  2  6  0  0  6  6  0
 0  0  2  2  0  6  6  0  0  6  2  0  0  2  6  0  4  6  6  4  4  2  2  4  4  6  6  4  4  2  2  4  2  4  4  2  4  6  6  4  4  2  2  4  4  2  0  2  0  6  2  0  0  6  6  4  0  2  6  0  0  6  6  0  0  2  2  0  0  6  2  4  0
 0  0  0  4  0  0  4  0  4  4  0  4  4  4  0  4  4  0  4  0  4  0  4  0  0  4  0  4  0  4  0  4  4  4  0  0  0  0  4  4  4  4  0  0  4  4  0  0  4  4  4  4  0  0  0  0  4  0  4  4  0  0  4  0  0  0  0  0  4  4  4  4  0
 0  0  0  0  4  4  4  4  4  4  0  4  0  0  4  0  0  0  0  0  4  4  4  4  4  0  0  4  0  4  4  0  4  0  0  4  4  0  0  4  4  4  4  4  0  0  0  0  0  4  0  4  0  4  4  0  4  0  4  0  4  0  0  4  0  0  0  4  4  4  4  0  4

generates a code of length 73 over Z8 who´s minimum homogenous weight is 70.

Homogenous weight enumerator: w(x)=1x^0+52x^70+78x^72+256x^73+72x^74+48x^76+4x^78+1x^144

The gray image is a code over GF(2) with n=292, k=9 and d=140.
This code was found by Heurico 1.16 in 90.8 seconds.