Engine Performance problem
2006 Hummer H2 V8 Four Wheel Drive Automatic

I recently took over as Shop Manager at a limo company and just caught the tail end of another tech installing a new oil pump. So i asked a few questions and learned the vehicle had low oil pressure and the company's owner made an instant diagnosis and said, "replace the oil pump."
Then the tech tried to start to motor without priming the oil pump. And then finally, after managing to start the motor without seizing it, there was still intermittent low oil pressure.
I checked the oil pressure sensor, it seems good. I'm waiting for my special tools to show up and i'll check the oil pressure at the top and the bottom. and i've learned that the camshaft bearings in this motor have a tendency to wear and start "walking" and blocking the galley holes.
Is this possible? And i'm trying to learn how exactly i can check the camshaft bearings. Please help! This is my first Shop Manager position and i'm not particularly familiar with Hummers yet. I don't want to look bad!