The generator matrix

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

generates a code of length 71 over GR(81,9) who´s minimum homogenous weight is 531.

Homogenous weight enumerator: w(x)=1x^0+144x^531+216x^537+144x^539+1344x^540+1008x^541+2304x^546+1440x^547+6768x^548+6864x^549+7344x^550+9936x^555+5400x^556+19656x^557+17232x^558+18576x^559+30672x^564+19872x^565+62280x^566+42696x^567+41760x^568+61848x^573+25776x^574+68616x^575+41392x^576+36288x^577+544x^585+440x^594+424x^603+264x^612+144x^621+40x^630+8x^639

The gray image is a code over GF(9) with n=639, k=6 and d=531.
This code was found by Heurico 1.16 in 42.8 seconds.