It is pretty much the holy bible how to rework stuff so you could sell fixed stuff also to customers. For hobbyist I think it is not necessary even though it is well written guidelines how to fix anything PCB related. It is meant mainly for professionals who need standards for their work.
Basically it covers reballing BGA's, foil fixes, jump wires, how to take stuff off, acceptable results for repairs etc etc etc. I can't remember everything that is there but I think it has about 300-500 pages. Perhaps you should ask Dave about it, I would think he has it somewhere around his lab.