The generator matrix

 1  0  1  1  1  1  1 X+6  1  1  1 2X  1  1 X+6  1  1  1  0  1  1  1  1 2X  1  1 2X+3  1  1  1 X+3  1  1  1  1  0  1  1  1  3  1  1  1  1  3  1  1  0  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1 X+6  1 2X  X  1
 0  1 2X+7  8 X+6 X+1 X+5  1 2X  7 2X+8  1 2X+7 X+6  1  8  0 2X  1 X+1 X+5  7 2X+8  1  3 2X+4  1  2 X+4 X+3  1 X+5 2X+2 2X  7  1  4 X+2 2X+3  1  7  4 2X X+5  1 2X+3 X+2  1  0  3 X+6 2X+3  0  6  3 X+6 X+3 2X+7 2X+4 X+1  4 X+1 2X+3 X+4 X+4  8  1 X+4  1  0 2X+8
 0  0  6  0  6  3  3  0  0  3  6  6  0  3  6  6  3  6  3  0  3  6  0  3  6  3  0  3  6  0  3  0  3  0  0  3  6  6  3  0  0  3  6  0  6  3  6  6  0  3  3  0  3  6  6  6  0  6  0  0  6  3  6  3  0  6  6  6  3  0  0
 0  0  0  3  3  6  3  3  3  0  6  0  0  3  3  3  0  0  3  6  6  6  6  0  0  0  0  3  6  3  3  6  6  0  6  0  0  3  3  3  0  6  3  3  0  0  6  3  3  6  0  6  3  6  3  0  0  6  3  0  3  0  6  3  6  0  6  3  6  6  0

generates a code of length 71 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 136.

Homogenous weight enumerator: w(x)=1x^0+312x^136+414x^137+364x^138+630x^139+936x^140+330x^141+678x^142+864x^143+314x^144+426x^145+612x^146+158x^147+348x^148+90x^149+42x^150+24x^151+12x^157+4x^168+2x^177

The gray image is a code over GF(3) with n=639, k=8 and d=408.
This code was found by Heurico 1.16 in 0.55 seconds.