Hide is the New Explode.
And it drives me crazy, when I spend a lot of time looking for a missing element only to discover that it had been hidden in view. This just happened on a 48 story high rise. Just to make sure I wasn't missing anything else, here's how I revealed all the mechanical equipment by view that may have been hidden.
First turn on Reveal Hidden Elements
Then select everything in the view. Use the Filter tool to pick only the things you are worried about.
If anything is hidden in view the Unhide Element tool will light up on the ribbon. Ughh.... click it and stuff.