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

generates a code of length 86 over Z49 who´s minimum homogenous weight is 509.

Homogenous weight enumerator: w(x)=1x^0+882x^509+174x^511+294x^516+102x^518+882x^523+36x^525+6x^532+6x^539+6x^546+12x^553

The gray image is a code over GF(7) with n=602, k=4 and d=509.
This code was found by Heurico 1.16 in 0.362 seconds.