The generator matrix

 1  0  0  1  1  1  X  1  1  X  1  X  1  0  1  1  1  1  1  1  X  1  1  0  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  1  X  X
 0  1  0  0  1 X+1  1  X X+1  1  0  0  1  1  X  X  X  0  0  1  1  X X+1  1 X+1  0  1  1  X  1 X+1 X+1  1  1  X X+1  0  0  X X+1  1  1
 0  0  1  1 X+1  0 X+1  1 X+1  X  X  1  X  1  1 X+1 X+1  1  0  1 X+1  X X+1 X+1  0  X X+1  X  X  1  X  X  0  0  0  1 X+1 X+1  0  1  1  1
 0  0  0  X  X  X  0  0  0  X  X  X  0  X  X  0  X  0  X  X  X  X  X  X  0  0  0  X  0  0  X  0  X  0  X  X  0  X  0  0  0  X

generates a code of length 42 over Z2[X]/(X^2) who´s minimum homogenous weight is 40.

Homogenous weight enumerator: w(x)=1x^0+32x^40+64x^42+24x^44+6x^48+1x^64

The gray image is a linear code over GF(2) with n=84, k=7 and d=40.
As d=40 is an upper bound for linear (84,7,2)-codes, this code is optimal over Z2[X]/(X^2) for dimension 7.
This code was found by Heurico 1.16 in 0.0147 seconds.