We tuned this vehicle (2012 CTS-V) back in December. We converted the vehicle to a dual map operating system so that the customer could run both 91 octane pump gas and E85. We had no issues reading or writing the controller at that time. The vehicle has returned for a retune due to some parts being changed. Now we can not read or write the controller, using either V 7.5 or V 8. We have noticed that the controller serial number has been corrupted. Attached are screenshots of the error messages and the corrupted serial number screen. Any ideas on how to rectify the problem? Thanks!