The generator matrix

 1  0  1  1  1  1  1  1  1  1  1  1  1  1  1  7  1  1  1  1  1  1  1 21  1  1  1  1  1  1  1 14  1  1  1  1  1  1  1 42  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 28  1  1  1  1  1  1  1  1  1  1  1  1  1
 0  1 36 31 16 48  4 19  7 29 38  9  6 46 26  1 21 43  3 23 20 11 40  1 14 15 45 44 13 32 33  1  0 36 31 16 48  4 12  1  7 29 38  2 41 39 42 22  3 47 37 27 25 24 28  8  5 30 34 18 35  1 45 10  9  1  6 46 21 43 23 20 11 17 14 15 44 13 32

generates a code of length 79 over Z49 who´s minimum homogenous weight is 471.

Homogenous weight enumerator: w(x)=1x^0+1008x^471+252x^473+294x^474+36x^476+756x^478+42x^480+6x^504+6x^511

The gray image is a code over GF(7) with n=553, k=4 and d=471.
This code was found by Heurico 1.16 in 39 seconds.