The generator matrix

 1  0  1  1  1  1  1  1  1  0  1  1  1  1  1  1  0  1  1  1  0  1  1  1  5  1  1  1  1  1  1  1 20  1  1  1  1  1 10  1  1  1  1  5  1  1  1 20  1  1  1  1  0 20  1  1  1 20  1  1 20  1  1  1  0  1 10  1  1  1
 0  1  1  7 24 18 16  0  7  1 18 14  0 16 14 18  1  7 18 16  1  7  0 14  1 12  5 14 16 23  6 19  1 13  5 12  4 11  1 10  0 12  3  1  1  7 10  1 13 13  8  2  1  1 12 13 15  1 11 12  1 23 24 17  1 13  1 15 18  0
 0  0 15  0  0  0  0  5 10 15 10 15 10 20  0 10  5 15 10 10 15  5 10 20  5 20 10  0 15 20 20 15 15 20  0  0 10 20  5  0 10 15 15  5 20 10  0  5 15  5  0 20 20  0 20 10  5 15  5  0 15  5  5  0  5 10 10 15 15  0
 0  0  0  5  0  5 15 15  0 10 10 20 10 10 15  5  0 10 10  0 10  5  0 20 15  0 20 10 15  5  5  0  0  5 10 20 10  5  5 20 20 10 10  0 20  0 15  5 15 15 15 10 15 10 15  5  0 10  0  0 20 10  5  5 10  5 15 15  5  0
 0  0  0  0 15 15 10 20 20  5 20 20 10  0  0 10 15 15 15 15 10 15  5 20  0  0 20 10  0 20  0  5 10 10  0 10 10 15 20  5 10 20  0  5 10 15 20 10  0  0 15 10 15 15 20 20 20  0 15 10 10 20  0 15 15  5 20  5  5  0

generates a code of length 70 over Z25 who´s minimum homogenous weight is 255.

Homogenous weight enumerator: w(x)=1x^0+56x^255+20x^257+40x^259+480x^260+600x^262+80x^263+840x^264+1124x^265+1700x^267+780x^268+2200x^269+1664x^270+3240x^272+1580x^273+3900x^274+2820x^275+5040x^277+3780x^278+6600x^279+3328x^280+7020x^282+4180x^283+7360x^284+2976x^285+5640x^287+2100x^288+3560x^289+2072x^290+1740x^292+500x^294+592x^295+172x^300+112x^305+100x^310+44x^315+44x^320+32x^325+4x^330+4x^335

The gray image is a code over GF(5) with n=350, k=7 and d=255.
This code was found by Heurico 1.16 in 12.4 seconds.