The generator matrix

 1  0  1  1  1  1  1  1  1  1  1  0  1  1  1  1  7  1  1  1  1  7  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1 28  1  1  1 28  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
 0  1  1 31 16 48  4 19  0 36 31  1 16 19  7 36  1  9 29 26  9  1 38  7 14 48  4 44  6 46 29 38  6 46 26  3 20 11 33  1  0 15 11  1 31 16 20 40 14  3  2 13 40 11  1 45 42 15 26 27  2 42 32  7 46 23 33 17 27 36 17 33
 0  0 35 21 42  7 14 21  7 28 14  7 35  0 28 14 35  7 21 35  0 42 42 42 14 28  0 21 35 28  7  0 14 21 42 28 21 42  7 14 35  0 35 28  7 28 42 14 42 42  0 35 42 14 14  0 35 28  7 28 42 21 28  7  7 14 35 35  0  7 14 28

generates a code of length 72 over Z49 who´s minimum homogenous weight is 421.

Homogenous weight enumerator: w(x)=1x^0+1806x^421+966x^422+882x^425+198x^427+3528x^428+1470x^429+294x^432+90x^434+2226x^435+630x^436+882x^439+2730x^442+1050x^443+12x^448+36x^455+6x^469

The gray image is a code over GF(7) with n=504, k=5 and d=421.
This code was found by Heurico 1.16 in 23.7 seconds.