The generator matrix

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

generates a code of length 20 over Z49 who´s minimum homogenous weight is 105.

Homogenous weight enumerator: w(x)=1x^0+432x^105+294x^108+528x^112+3528x^115+408x^119+10584x^122+408x^126+528x^133+96x^140

The gray image is a code over GF(7) with n=140, k=5 and d=105.
This code was found by Heurico 1.16 in 0.197 seconds.