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  X  1  1  1  1  1  1  1 4X  1  1  1  1  1 2X  1  1  1  1  X  1  1  1 4X  1  1  1  1  0 4X  1  1  1 4X  1  1 4X  1  1  1  0  1 2X  1  1  1
 0  1  1  2  4  3 3X+1  0  2  1  3 3X+4  0 3X+1 3X+4  3  1  2  3 3X+1  1  2  0 3X+4  1 X+2  X 3X+4 3X+1 X+3 X+1 4X+4  1 4X+3  X X+2 X+4 2X+1  1 2X  0 X+2 2X+3  1  1  2 2X  1 4X+3 4X+3 3X+3 4X+2  1  1 X+2 4X+3 3X  1 2X+1 X+2  1 X+3  4 2X+2  1 4X+3  1 3X  3  0
 0  0 3X  0  0  0  0  X 2X 3X 2X 3X 2X 4X  0 2X  X 3X 2X 2X 3X  X 2X 4X  X 4X 2X  0 3X 4X 4X 3X 3X 4X  0  0 2X 4X  X  0 2X 3X 3X  X 4X 2X  0  X 3X  X  0 4X 4X  0 4X 2X  X 3X  X  0 3X  X  X  0  X 2X 2X 3X 3X  0
 0  0  0  X  0  X 3X 3X  0 2X 2X 4X 2X 2X 3X  X  0 2X 2X  0 2X  X  0 4X 3X  0 4X 2X 3X  X  X  0  0  X 2X 4X 2X  X  X 4X 4X 2X 2X  0 4X  0 3X  X 3X 3X 3X 2X 3X 2X 3X  X  0 2X  0  0 4X 2X  X  X 2X  X 3X 3X  X  0
 0  0  0  0 3X 3X 2X 4X 4X  X 4X 4X 2X  0  0 2X 3X 3X 3X 3X 2X 3X  X 4X  0  0 4X 2X  0 4X  0  X 2X 2X  0 2X 2X 3X 4X  X 2X 4X  0  X 2X 3X 4X 2X  0  0 3X 2X 3X 3X 4X 4X 4X  0 3X 2X 2X 4X  0 3X 3X  X 4X  X  X  0

generates a code of length 70 over Z5[X]/(X^2) 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 linear code over GF(5) with n=350, k=7 and d=255.
This code was found by Heurico 1.16 in 12.5 seconds.