Vard

It's the weirdest thing. When CoH first launched I made it to level 30+ without any difficulty. But this has me stumped. I scoped the entire periphery of the warehouse but couldn't find any doors or staircases leading to another level. Tried asking for help in the chat, but no luck. So I keep having to start this mission over ... Ugh. Attached is a screenshot of my predicament. It appears there are villains directly below me. This is demoralizing!

I'm just getting started in Homecoming and am having trouble finding some of the villains I'm supposed to defeat inside a building. They appear to be located on a floor underneath me, but I can't find stairs or any other way to get to them. Does anyone have any advice?