The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  2  0  2  1  1  0  1  2  0  1  1  2  1  1  0  2  1  1  0  1  1  2  0  1  0  1  0  2  1  2  2  2  1  1  1  1  1  1  1  0  1  1  2  1  2  2  1  4  1  1  1
 0  2  0  6  0  6  0  6  0  6  0  6  4  6  6  0  6  0  0  6  6  2  6  0  6  2  4  6  2  2  4  6  4  6  2  6  2  6  2  0  0  6  2  2  2  0  2  6  2  0  6  4  4  0  2  6  0  2  2  2  6  4  0  6  0  6  0  0  0  0  0
 0  0  4  0  0  0  0  0  0  0  0  0  4  0  0  4  0  0  4  0  0  0  4  0  0  4  4  4  0  0  4  4  0  4  0  4  0  4  4  0  4  0  4  4  0  4  4  4  0  4  0  0  0  4  0  4  0  0  0  4  4  4  0  4  0  0  4  4  4  0  0
 0  0  0  4  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  4  4  4  4  4  4  4  4  4  4  4  4  4  4  4  0  4  4  4  4  0  4  4  0  4  4  0  0  4  0  0  4  4  0  0
 0  0  0  0  4  0  0  0  0  0  0  0  0  4  4  4  4  0  4  4  0  4  0  0  0  4  4  4  4  4  4  4  4  4  4  0  4  4  4  0  0  0  0  4  4  4  4  4  4  4  4  0  0  0  4  0  4  4  0  0  4  4  0  4  0  4  4  4  4  0  0
 0  0  0  0  0  4  0  0  0  0  0  0  0  4  0  4  4  0  0  4  0  0  0  4  0  4  0  0  4  0  4  4  0  0  0  4  4  0  0  4  4  0  4  4  0  4  0  4  0  4  0  4  4  4  0  0  0  4  0  0  4  0  0  0  0  4  4  0  0  4  0
 0  0  0  0  0  0  4  0  0  0  0  0  4  0  4  4  0  4  4  4  0  0  4  4  0  0  0  4  4  4  4  0  4  4  4  0  4  0  0  4  4  4  4  0  0  4  4  0  0  4  4  4  0  4  4  0  0  4  0  0  4  4  0  4  4  4  0  4  4  0  0
 0  0  0  0  0  0  0  4  0  0  0  0  0  0  0  0  0  0  0  4  4  4  4  4  4  0  4  0  4  0  0  4  0  4  0  4  0  0  4  4  4  0  4  4  0  0  0  4  4  0  0  0  4  0  4  0  4  4  4  4  0  4  4  4  4  0  4  0  4  4  0
 0  0  0  0  0  0  0  0  4  0  0  0  4  4  0  4  4  4  0  0  4  4  4  4  4  4  0  4  4  0  4  4  4  4  0  4  4  4  4  4  4  4  0  0  0  0  4  4  4  4  0  0  0  0  0  0  0  4  0  0  4  0  4  4  4  4  0  0  0  0  0
 0  0  0  0  0  0  0  0  0  4  0  0  0  0  0  0  4  4  4  0  4  0  0  0  4  4  4  4  0  4  0  4  0  4  0  0  4  4  0  4  0  4  4  0  0  4  4  0  0  4  0  4  0  0  0  0  4  4  4  4  0  0  4  4  0  0  4  0  0  0  4
 0  0  0  0  0  0  0  0  0  0  4  0  4  4  4  4  0  4  0  0  4  4  0  4  0  4  4  0  4  4  0  0  0  4  4  4  4  4  0  0  4  0  4  4  4  4  4  4  0  4  0  4  0  0  0  0  4  0  0  0  0  4  4  4  0  0  0  4  0  4  4
 0  0  0  0  0  0  0  0  0  0  0  4  0  0  4  4  4  4  4  4  0  4  4  0  4  0  0  4  0  0  4  4  0  4  0  0  0  4  0  0  4  0  0  0  4  4  0  4  4  0  0  4  0  4  0  0  4  4  4  4  4  0  0  0  0  4  4  0  4  0  4

generates a code of length 71 over Z8 who´s minimum homogenous weight is 54.

Homogenous weight enumerator: w(x)=1x^0+45x^54+6x^55+114x^56+48x^57+181x^58+120x^59+270x^60+240x^61+396x^62+598x^63+520x^64+1336x^65+679x^66+2742x^67+886x^68+4540x^69+1005x^70+5346x^71+991x^72+4500x^73+908x^74+2734x^75+738x^76+1320x^77+509x^78+642x^79+369x^80+256x^81+248x^82+98x^83+138x^84+44x^85+89x^86+51x^88+4x^89+31x^90+2x^91+16x^92+3x^94+2x^96+1x^98+1x^118

The gray image is a code over GF(2) with n=284, k=15 and d=108.
This code was found by Heurico 1.16 in 75.8 seconds.