The Assimilated module is available through a mission called Assimilated I believe, but what if you have already completed that mission and I don't believe mission replay on this one is available?
mission replay is avilable on that mission (done it myself)
just go to your captains room on your ship interior
and use the replay consol on the table.
then go to the undine missions and chose the asmiliated mission
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just go to your captains room on your ship interior
and use the replay consol on the table.
then go to the undine missions and chose the asmiliated mission