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  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1
 0  3 24  0 21 24 21  6  0  9 21 24  0 12 15  9 12 24  9 21  9  6 12  6 18 12  6  0  0  9  9 21 21 12 12 24  6  6 24  0 21 24 18  3 15  9 15  0  3 21 15 18 12 15 18  3  6  9 12 15  3 15  9 18 18 18 21 12  0 15 24  3 15 18  3  0
 0  0  9  0 18 18  9  0  9 18 18  0  9  0  9  9  0  9 18  9  0 18  9  0 18 18 18  0  9  9  0 18  9  9 18  0 18  0 18 18  0  9  9  9  9  0  0 18  0  0  9 18 18 18  9  9  9 18  0  0 18 18  9  0  0 18  0  9 18 18  0 18  0  0 18  0
 0  0  0  9  9 18 18  9 18  9 18 18  0 18 18  9  9  9 18  9 18  9  0  0  0  0  0 18  9  0  0  0  0  9 18  9 18 18  0  0  0 18 18 18  9  9  0 18  9 18  0  9  9  9  9  9 18  0  0  9 18  0 18  0  9 18  9 18  9 18  0  9 18 18  0  0

generates a code of length 76 over Z27 who´s minimum homogenous weight is 147.

Homogenous weight enumerator: w(x)=1x^0+12x^147+84x^149+100x^150+1782x^152+90x^153+72x^155+34x^156+6x^158+2x^159+2x^162+2x^228

The gray image is a code over GF(3) with n=684, k=7 and d=441.
This code was found by Heurico 1.16 in 0.249 seconds.