The generator matrix

 1  0  0  1  1  1  1  1  1  1  1  1  1  1 a^6*X
 0  1  0  1  a a^2 a^6*X+a^3 a^6*X+a^4 a^5 a^6 a^6*X a^6*X+1 X+a X+a^2  1
 0  0  1 a^6  a a^4  1 a^5 a^3 a^2 a^3*X+1 a*X+a^5 a^6*X a^5*X+a^2 X+a^6

generates a code of length 15 over F8[X]/(X^2) who´s minimum homogenous weight is 91.

Homogenous weight enumerator: w(x)=1x^0+1344x^91+4536x^92+189x^96+2688x^98+18816x^99+27216x^100+168x^104+57344x^105+18816x^106+65856x^107+65016x^108+42x^112+112x^120

The gray image is a linear code over GF(8) with n=120, k=6 and d=91.
This code was found by Heurico 1.16 in 1.83 seconds.