I am about to take my bass in for a major tune-up. The Luthier is well regarded, but new to me. Aside from a new bridge, and better fitting or replacement of the soundpost, I want to have the fingerboard planed and shaped a tad. I'm not trying to get the action waaayy down - I have it at around 8mm to 10-11mm with Obligatos and would be happy to keep it there or just a shade lower. But I know the board has some areas where the scoop is off kilter, making the playing and tone a little off on certain notes. I'd like to get a more accurate picture of just where the problem lies, the better to discuss things with the luthier before he sets to work. Wonder if anyone could describe a good, reasonably methodical way to more accurately assess exactly what's not right about the board right now, so I can have a useful conversation with the luthier? I have read a bit here and there, notably some interesting stuff involving chalk and straightedges in a rant on Jeff Bollbach's own website, but I was hoping for more specific "how-to" advice on diagnosis from the gang here. TIA.