Question about coins that were upgraded during regrade submissions

So if you get a coin to actually upgrade, and it gets a new serial number; what happens to the original serial number listed in your registry set? Does it go poof, along with your info and pic?
WS
WS
Proud recipient of the coveted PCGS Forum "You Suck" Award Thursday July 19, 2007 11:33 PM and December 30th, 2011 at 8:50 PM.
0
Comments
I ran into trouble when I had 12 half eagles re-graded and the all came back with different numbers even the ones that came back the same grade. The trouble was they forgot to register them in the system and I had to scan them all in to prove they were legit.
As a result, I worry that PCGS population reports might be wrong.
Go BIG or GO HOME. ©Bill