I have a Centofante 3 with VG-10 blade, and the blade shows several stains and discoloration from just normal use. Is this normal for Spyderco's VG-10? The FRN scales show a lot of wear on the clip side. Is the discoloration and wear on the scales grounds for replacement under warranty? I don't really want to send it in unless I'm fairly sure these issues will be dealt with, unless I am out of line to expect this. This is my only Spyderco and my only VG-10 blade. Thanks for the input.