Filling in a couple of blanks and adding some info :
Step 1, Destroy barrels of weapon oil - Last barrel for me was in a different elevation and quite distant from the other barrels, even though still technically in the western side, it was less west than the others on a higher elevation map.
Step 2, Kill Sarnak Weapon Smiths - plus 20 alt currency, xp and coin
Step 3, Kill Death Shaman Yugg, loc 498, 2010, -249 (same room as Incarnate Droga raid, on deck, single), plus 40 alt currency, xp and coin