I've had issues with fret buzz on my Brian Moore i4 recently. This bass had a pro setup and some job done on the neck about a month and half ago, so I would be surprised if the issue was something that required major work (else I would guess the person doing the setup would have done it). The guy who did the setup had to send it to a luthier because apparently, the truss rod on it was maxed out and it still had a bow.
It was working great once I got it back. But now, I get fret buzz on the first 2-3 frets, and most pronounced on the second fret of the A string. It's not buzzing too hard, but still enough to be very annoying.
I'm guessing it's probably an issue with neck relief, but I'd like to have a second opinion before I go and ruin a setup I paid for. I don't think I have good enough eyes to just "see" a bow. It all seems straight to me.