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  7  1  1  1  1  1  1
 0  7  0  0  0  7  7 28  0 21  7 42 14 42  0 35 28 14  7  7 28 21 35 14  7  0 21  0 28  7  0
 0  0  7  0  0 35 28 35  7 28 35 35  7  7  7 21 21 28  7  0 42 35 14 28  7 42 35  7  7 35  0
 0  0  0  7  0 35 21 21 35 35  7 42  0 14 42 14 21  7 21 21 14 35  0 28 28  7  7 28  0  7  7
 0  0  0  0  7 35 42  7 42  7  7  0 14  7  7 28 42 28  0 21 35 28 21 28 14 28  7 35 21 14 28

generates a code of length 31 over Z49 who´s minimum homogenous weight is 154.

Homogenous weight enumerator: w(x)=1x^0+246x^154+978x^161+1560x^168+2166x^175+14406x^180+2628x^182+86436x^187+3342x^189+3054x^196+2046x^203+684x^210+102x^217

The gray image is a code over GF(7) with n=217, k=6 and d=154.
This code was found by Heurico 1.16 in 5.83 seconds.