The generator matrix

 1  0  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  0  1  1  1  7  1  1  1  1  1  7  1  1  1
 0  1  1 31 16 48  4 19  0  7  7 36 48 19 31 16  4  1 26 36  9  1  6 38 46 38  6  1  9 37 21
 0  0 35 21 42  7 14 21  7 28 14 42 35 28 14  0  7 42 35 21  7 35  0 35 42 28 28 14 21 14  7

generates a code of length 31 over Z49 who´s minimum homogenous weight is 175.

Homogenous weight enumerator: w(x)=1x^0+420x^175+756x^176+798x^177+2040x^182+2016x^183+1344x^184+4014x^189+3402x^190+1974x^191+18x^196+24x^217

The gray image is a code over GF(7) with n=217, k=5 and d=175.
This code was found by Heurico 1.16 in 0.051 seconds.