I have never replaced my firing spring in my SH2 (i know not a SP-01 but close) or the pin itself. I've fired at least 15000+ rounds now. I have been advised by competition shooters to replace these every 10000 as a precaution. I don't know about the firing pin.
I think it all depends on what you're using the gun for. I would say if it works don't replace it unless you are using the weapon for self defense. Perhaps then it is a good idea to replace it as a precaution every 10000 rounds.
Hope this helps.
