The generator matrix

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

generates a code of length 76 over Z9[X]/(X^2+3,3X) who´s minimum homogenous weight is 140.

Homogenous weight enumerator: w(x)=1x^0+672x^140+1466x^141+4194x^142+6546x^143+9858x^144+13482x^145+17532x^146+22558x^147+29970x^148+35052x^149+42468x^150+47328x^151+49428x^152+50066x^153+50442x^154+43476x^155+35640x^156+27984x^157+18480x^158+12116x^159+6402x^160+3282x^161+1440x^162+840x^163+378x^164+68x^165+96x^166+48x^167+2x^168+54x^169+54x^170+6x^171+12x^173

The gray image is a code over GF(3) with n=684, k=12 and d=420.
This code was found by Heurico 1.16 in 539 seconds.