ChazD
Welcome ChazD. Well, if you've lurked for a while you probably understand that there are no new internal parts available except batteries and quartz crystals. Modules are the golden items...ugly watches are raped for their "engine". Different people have some schematics, but their value is mainly in simple knowledge seeking, since most of the circuitry is tied up in ICs that can't be worked on anyway. Old repair books from the LED era pop up occasionally on ebay or you stumble upon one at some sort of sale. Start slow, ask questions and approuch it with a sense of humor....kind of like women!
And look at our "Before you Buy" section, all kinds of dodgy deals and charecters out there. "Someone always has to piss in the pool"