The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  X  1  1  1  1  6  1  1  X  1  1  0  X  1  1  1  0  1  X  1  X  1
 0  X  0  0 2X X+6  X 2X+6 2X X+6  6  0 X+6 2X+6  3 2X 2X+6 X+6  6  0 2X+6  X X+3  X 2X+6  3 2X 2X+3 2X+3 X+3 X+3 X+6  3 2X+6  3 X+6  X X+6  3  0 2X  0 X+6 X+3 2X+6  3 2X+6 X+3  3  6 2X+3  3 X+6 2X X+6 2X+6 X+3 2X  X X+3 X+6 2X+6 2X 2X+6  3  0  0 2X+3 2X+6  X X+6 X+6  0 2X+6  3
 0  0  X 2X  0 2X+3  X X+3 2X+3 2X+6  X  6 X+3 X+3 2X  6 2X  0 2X+3  3 X+3  0 2X+3 X+3  0 X+6 2X+6 X+3 2X  3 2X+3 X+6 X+3  X  6  X 2X+6 2X  6 2X+6 X+6 2X+6 X+3  6  0  6  0  6  X  6 2X+3 X+6  X  6 2X+6  0 X+3 2X  X 2X+3 2X+3 X+6 2X+6 2X  X 2X  0  6  X 2X+3 X+3  3 2X+3 X+6 2X+3
 0  0  0  3  0  0  0  6  0  3  6  3  6  3  6  0  0  6  0  3  6  3  6  3  0  0  6  6  0  3  3  0  3  3  0  6  6  0  6  0  3  0  3  0  6  6  6  6  3  3  3  0  0  0  6  3  6  3  0  6  3  6  0  6  3  0  3  6  0  6  3  0  3  3  3
 0  0  0  0  3  6  3  0  6  0  6  3  0  0  0  0  0  6  0  0  3  3  3  6  6  6  0  6  3  0  6  6  0  6  6  6  6  3  0  6  3  3  3  6  6  6  0  0  6  6  3  3  0  6  0  0  3  0  3  0  3  3  0  3  3  6  0  3  3  0  0  6  3  6  6

generates a code of length 75 over Z9[X]/(X^2+6,3X) who´s minimum homogenous weight is 140.

Homogenous weight enumerator: w(x)=1x^0+342x^140+282x^141+18x^142+756x^143+504x^144+144x^145+1740x^146+1030x^147+918x^148+3642x^149+1588x^150+1548x^151+3732x^152+1152x^153+288x^154+690x^155+228x^156+348x^158+116x^159+174x^161+96x^162+144x^164+70x^165+78x^167+30x^168+18x^170+2x^171+2x^174+2x^201

The gray image is a code over GF(3) with n=675, k=9 and d=420.
This code was found by Heurico 1.16 in 33.9 seconds.