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

generates a code of length 42 over Z49 who´s minimum homogenous weight is 217.

Homogenous weight enumerator: w(x)=1x^0+192x^217+1008x^224+1524x^231+1812x^238+2208x^245+14406x^246+2736x^252+86436x^253+2664x^259+2232x^266+1638x^273+588x^280+186x^287+18x^294

The gray image is a code over GF(7) with n=294, k=6 and d=217.
This code was found by Heurico 1.16 in 8.56 seconds.