I've never gotten into Pokemon or Magic, but I'm hooked on Metal Gear Acid. However, I'm stuck on level 9, where you're supposed to find the boss Leone in the warehouse.

I've attained all three-colored uniforms and covered every room that I can find, but I can't figure out where Leone is supposed to be. The level begins with the boss telling me to crawl through airducts or crawlspaces, but I can only find one of those to the east. Can anyone offer a tip?