You work for an electrical services firm and have been sent out on a job for a first-time client. It's an office building, and you meet with the HR manager who doubles as the facilities manager.
The complaint is that “old breakers” keep tripping at inconvenient times. He takes you to the electrical room, where you notice a box of fluorescent lamps leaning against the bottom of the circuit panel door. This is “proof” that nobody is operating the breakers, else the box would have been moved. He's kept track of the rogue breakers (all supply receptacles, none supply lights) and wants them replaced.
Should you replace or troubleshoot? If the latter, how?
If you can solve the real problem, you will score major customer loyalty points. Those lamps don't belong in the electrical room, and the “box trap” doesn't prove anything.
Since the loads are selectively shut off (just equipment), it sounds like a disgruntled employee might be the source of the problem.
You need to determine whether the breakers are tripping or being manually opened. That means seeing the trip indicator. So, ask the client to monitor for a few days and snap a photo of any “rogue” breaker before resetting it.
The next step is to secure the room by keeping it locked and controlling access to it.