The generator matrix

 1  1  1  1  1  1  1  1  X  X  1  1  X  1  1  X  X  X  X
 0 X^3  0  0  0 X^3 X^3 X^3  0  0  0 X^3 X^3  0 X^3  0 X^3 X^3 X^3
 0  0 X^3  0 X^3 X^3 X^3  0  0 X^3  0 X^3 X^3 X^3 X^3 X^3  0 X^3  0
 0  0  0 X^3 X^3  0 X^3 X^3 X^3 X^3  0  0  0  0 X^3  0 X^3 X^3  0

generates a code of length 19 over Z2[X]/(X^4) who´s minimum homogenous weight is 18.

Homogenous weight enumerator: w(x)=1x^0+18x^18+96x^19+6x^20+4x^22+1x^24+2x^26

The gray image is a linear code over GF(2) with n=152, k=7 and d=72.
As d=75 is an upper bound for linear (152,7,2)-codes, this code is optimal over Z2[X]/(X^4) for dimension 7.
This code was found by Heurico 1.16 in 0.015 seconds.