We got to watch Patrice test a couple guitars at the factory during our recent visit. Patrice tests literally every single guitar that comes through. If it doesn't get his stamp at the end of the process, it goes back for modifications or to have parts replaced. If it does pass the test, it gets cleaned up and shipped!
Specifically, he's looking at the neck relief, ensuring there are no dead spots, making sure the bridge is up to snuff, tuning is incredibly stable and that the electronics are wired correctly and will hold up.
The guitar Patrice is testing in this video is an Excalibur Special LE. Specs can be found here:
Patrice Vigier Testing an Excalibur before it ships!