I've played the heroic reprise of Siren Song three times for "The Investigation" quest but the "Looking for a Lead" step stays incomplete. I'm sure I'm doing the right adventure because 1) it says "heroic" and is indicated as "Looking for a Lead" on the adventure marker, and 2) the voice lines from the Drifter happen before and at the end of the final encounter.
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No. You did the heroic siren song. You need to go to bottom of Sloane building & get proper adventure there