I was asked to do a setup for a guy the action was 1/2" high over the last fret! Then I had a crack appear, luckily not an expensive guitar, just sentimental value as it belonged to the guys deceased father in law bought in Morocco 60+ years ago. When I took the strings off a crack appears down the glue line of the top from the bottom of the soundhole to the first brace, ladder braces, this brace had come loose too, but luckily the crack stopped there. I don't know if I did the right thing when repairing it, but I laid a damp bandage over the crack until it had swollen shut then rubbed some titebond in, then re-strung and allowed to dry. I then got some sandpaper between the top and the brace to clean the joint then moistened it to allow the titebond to wick in and clamped shut all before I could start the setup!
When setting up the guitar I noticed the fingerboard was cupped so did my first stone and set on it rather than a polish, with a bolt on neck I thought it was gonna be an easy job
then after all that I notices the neck seemed to be a three pine laminate, and over the time it was in my hands I had to re shim the neck to get the action where I wanted it to be and just explained to the guy but he was happy enough, as he'd never heard it played let alone played it, another thing I noticed with it was that the intonation was way out, but if you put a capo on the first fret it all sounded fine, and it really came alive when playing a song in G I assume it's something to do with the natural resonant frequency of the box, but is something I'd never experianced in an x braced instrument.
And after all I was happy too as it gave me well valued experience!