Sam Lau

So here is my situation, my ayc pump is going bad recently. I am trying to get warranty through dealership. The service manager is really nice and tells me mitsu will ask for CVN and CAL ID to honor the claim (sucks that tune has nothing to do with pump failure). My car had two owners before me. The problem is the first owner had car open source tuned and I would assume those two numbers changed. Second owner did AP protune so it's not a problem. Will I be able to reverse CVN and CAL ID back to stock stock? Do I just flash 2013 stock rom to change it back? Thank you guys for the input!