But the thing is. "Lemon" for me is a dud, something that is fraught, or haunted (even cursed) at the manufacturing. In Sweden we call it a "wolf", or a bastard, dud, something that is badly made from scratch by bad luck. Friday afternoon items, the odd one. It lacks that MOJO whatever you try to do. Those ones that are supposed to come out well from the factory, but doesn't, but really passes the QC's anyway. Like you can pick two neighboring basses with a serial number alike but one last digit, and compare them, and for some unexplainable reason, one of them turns out to be that lemon.
Lemon for me is not something that you can fix afterwards with a reasonable amount of setup. Lemon for me, is when even a highly skilled luthier can't do anything about it, and says "I've seen much better examples of this". To me, a lemon can even be a design flaw inherent in the bass from the start on. I e that ALL items spit out from the production lines are so on the verge that they are about to self destruct ... but, just a fluke if they make it. I tell you what, I call ALL half acoustic basses, like Hofner basses, and Epiphone 335 like basses, lemons. All electric basses should be solid. Not even boutique "chambered" ones. They just resonate badly and feed back badly at certain notes at low volumes. Dead spots by the truckloads. So I consider them lemons right from the drawing board.
But as always YMMV when interpreting what is lemon and not.