Jetbike(OP) did say he was having trouble, even by his own, "not delicate" standards before the guy worked on the bass.
It had gone from the best bass he'd ever played, to" not being in true."
So he dropped it off for a set up.
Sure, a second opinion is in order. But the neck may have a problem that the tech neither caused, nor could repair.
Since its not working I'd suggest watching a few YouTube videos on set up, and some gentle explorations at home. This isn't voodoo or rocket science.
When you sight down the string from bridge to nut (a straight line reference), what do you see? Is the neck bowed ( sags away from the strings in the 12 th fret area), back bowed ( arches up towards the string), or straight?
Fret buzz on the lowest frets makes me think the neck is back bowed, a sign of an over tight truss rod.
Ideally, the neck should have a slight, consistent bow, known as neck relief. Some folks like a very flat neck.
So, have a beer, take look down the neck, and tell us what you see. Check out a video or two, gather the right wrenches, you'll be a set up pro in no time.
Or it could be broke, but we're not going to jump to conclusions, just yet.
Right, beer, tools, YouTube, let's get to work. Report back.