The generator matrix

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

generates a code of length 89 over Z49 who´s minimum homogenous weight is 518.

Homogenous weight enumerator: w(x)=1x^0+3168x^518+4536x^519+2142x^520+1470x^521+588x^522+798x^523+504x^524+7062x^525+10962x^526+3738x^527+2814x^528+1176x^529+1218x^530+672x^531+9120x^532+11214x^533+4872x^534+2562x^535+1176x^536+1050x^537+378x^538+8460x^539+10626x^540+3402x^541+2604x^542+1176x^543+1050x^544+504x^545+7482x^546+7938x^547+2310x^548+840x^549+12x^553+12x^560+12x^567

The gray image is a code over GF(7) with n=623, k=6 and d=518.
This code was found by Heurico 1.16 in 6.42 seconds.