The generator matrix

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

generates a code of length 22 over F8[X]/(X^2) who´s minimum homogenous weight is 140.

Homogenous weight enumerator: w(x)=1x^0+336x^140+5208x^141+7392x^142+154x^144+2240x^147+4704x^148+31248x^149+24640x^150+217x^152+32256x^154+15680x^155+16464x^156+74648x^157+46816x^158+42x^160+35x^168+63x^176

The gray image is a linear code over GF(8) with n=176, k=6 and d=140.
This code was found by Heurico 1.16 in 3.14 seconds.