Issue with X-Marks The Spot Mission

I just started X marks the Spot on Borderlands 2 on the PS4, and after I left the lighthouse I rode the lift before fighting off all of Scarletts lieutenants. I went back up to the top of the lighthouse area, and found a few minions, but no lieutenants. Could someone tell me how to resume this mission please?

Its not the minions your looking for. If you jump of the tower opposite the way you came up you will land on the top of a spire and that is where the x marks the spot is. If you are in the lighthouse at the top look for the one opening that is blocked off. Took me a while to find myself.